US3916508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a reference voltage source with a desired temperature coefficient
Assignee: Robert Bosch GmbH
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Filing: 1974-03-04
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Granted: 1975-11-04
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Expires: 1994-03-04
Abstract
Abstract A temperature stability of a high order is obtained by voltage divider trimming in a circuit in which a common current supply feeds a first branch containing one or more Zener diodes and a second branch containing a voltage divider composed of ohmic resistances, from the tap of which the output voltage is taken, by provision of a circuit configuration meeting one design criterion and trimming an output voltage divider to meet, at a single reference temperature, another design criterion and thus to set both the designed output voltage and the designed temperature coefficient, independently of the scatter of the characteristics of the diodes in the circuit.
Inventors
- 👤 Gerhard Conzelmann
- 👤 Hartmut Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:26
CPC Classifications
G; G05; G05F; G05F3/00; G05F3/02; G05F3/08; G05F3/10; G05F3/16; G05F3/18; G05F1/00; G05F1/10; G05F1/46; G05F1/468; G05F3/20; G05F3/22; G05F3/222; G05F3/225; Y; Y10; Y10S; Y10S323/00; Y10S323/907; Y10S438/00; Y10S438/983; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
180 words
A method of making a source of reference voltage having a desired temperature coefficient of said reference voltage and containing at least one Zener diode, the number of Zener diodes being designated k, and a number of conductively poled diodes, possibly zero and designated l, connected in series with said Zener diode(s) and comprising also a shunt circuit branch connected in parallel with said Zener diode(s) and the aforesaid conductively poled diodes, composed of a resistive voltage divider having an intermediate tap providing an output terminal for a reference voltage (U1) and, in series with said voltage divider, a number of conductively poled diodes, possibly zero and designated m, connected between a first pole of a current supply source and said voltage divider and also at least one conductively poled diode, the number thereof being designated n, connected between said voltage divider and a second pole of said current supply means, which method comprises the steps of: making a source of reference voltage having components as above set forth in such a way as to approximate a design criterion of
Claim 2
Independent Claim
180 words
A method of making a source of reference voltage having a desired temperature coefficient of said reference voltage and containing at least one Zener diode, the number of Zener diodes being designated k, and a number of conductively poled diodes, possibly zero and designated l, connected in series with said Zener diode(s) and comprising also a shunt circuit branch connected in parallel with said Zener diode(s) and the aforesaid conductively poled diodes, composed of a resistive voltage divider having an intermediate tap providing an output terminal for a reference voltage (U1) and, in series with said voltage divider, a number of conductively poled diodes, possibly zero and designated m, connected between a first pole of a current supply source and said voltage divider and also at least one conductively poled diode, the number thereof being designated n, connected between said voltage divider and a second pole of said current supply means, which method comprises the steps of: making a source of reference voltage having components as above set forth in such a way as to approximate a design criterion of
Claim 3
Dependent Claim
63 words
A method as defined in claim 1 in which the aforesaid step preceding the step of modIfying voltage divider resistance values is carried out by providing for the occurrence of a voltage drop UDo per diode across the conductively poled diodes and for a temperature coefficient AD of the conductively poled diodes so chosen by reference to the current density that the condition
Claim 4
Dependent Claim
49 words
A method as defined in claim 1 in which the aforesaid step preceding the step of modifying voltage divider resistance values is carried out by constituting a circuit in which the number of diodes in the two parallel circuits designated by l, k, m and n satisfies the condition
Claim 5
Dependent Claim
32 words
A method as defined in claim 1 in which said voltage divider is trimmed progressively by removal of portions of the resistors of said voltage divider at least in part by sandblasting.
Claim 6
Dependent Claim
40 words
A method as defined in claim 1 in which a reference voltage source is produced in monolithic integrated circuit form and in which the trimming of said voltage divider (R1, R2) is carried out on a monolithic integrated circuit chip.
Claim 7
Dependent Claim
27 words
A method as defined in claim 5 in which said voltage divider (R1, R2) is trimmed during the premeasurement of the chip on a wafer test equipment.
Claim 8
Dependent Claim
58 words
A method as defined in claim 6 in which at least one of the resistors (R1, R2) constituting said voltage divider is subdivided into at least two resistor portions for purposes of trimming and that the trimming step is carried out by the interruption of at least one conduction path by which said resistor portions were originally interconnected.
Claim 9
Dependent Claim
46 words
A method of manufacture as defined in claim 7 in which the resistance values of said resistor portions utilized in the trimming step are related to each other in the progressive ratio 1 : 2 : 4 : 8 : 16 : 32 : ... .
Claim 10
Dependent Claim
112 words
A method as defined in claim 1 in which the step of trimming a voltage divider is performed with a voltage regulator connected with said source of reference voltage as made prior to the trimming step, so as to form a voltage stabilizer together, said voltage stabilizer providing a stabilized output voltage UA at the output of a second voltage divider (R3, R4), and in which the desired stabilized voltage UA is obtained by variation of the first voltage divider (R1, R2) in the completion of the manufacture of the source of reference voltage as aforesaid, and in which, further, the second voltage divider (R3, R4) has a resistance ratio defined as
Claim 11
Dependent Claim
34 words
A method as defined in claim 1 in which said voltage divider is trimmed progressively by removal of portions of the resistors of said voltage divider at least in part by laser beam cutting.
Claim 12
Dependent Claim
33 words
A method as defined in claim 1 in which said voltage divider is trimmed progressively by modification of portions of the resistors of said voltage divider at least in part by electrochemical action.
Claim 13
Independent Claim
222 words
A method of making a source of reference voltage having a desired temperature coefficient of said reference voltage and containing at least one Zener diode, the number of Zener diodes being designated k, and a number of conductively poled diodes, designated l, connected in series with said Zener diode(s) and comprising also a shunt circuit branch connected in parallel with said Zener diode(s) and the aforesaid conductively poled diodes, composed of a resistive voltage divider having an intermediate tap providing an output terminal for a reference voltage (U1) and, in series with said voltage divider, a number of conductively poled diodes, possibly zero and designated m, connected between a first pole of a current supply source and said voltage divider and also at least one conductively poled diode, the number thereof being designated n, connected between said voltage divider and a second pole of said current supply means, at least one of said last mentioned diodes being a dual-function diode by virtue of being also connected in cascade with said Zener diode(s) and counting also as one of said first mentioned group of conductively poled diodes, the number of which is designated l, which method comprises the steps of: making a source of reference voltage having components as above set forth in such a way as to approximate a design criterion of
Claim 14
Independent Claim
222 words
A method of making a source of reference voltage having a desired temperature coefficient of said reference voltage and containing at least one Zener diode, the number of Zener diodes being designated k, and a number of conductively poled diodes, designated l, connected in series with said Zener diode(s) and comprising also a shunt circuit branch connected in parallel with said Zener diode(s) and the aforesaid conductively poled diodes, composed of a resistive voltage divider having an intermediate tap providing an output terminal for a reference voltage (U1) and, in series with said voltage divider, a number of conductively poled diodes, possibly zero and designated m, connected between a first pole of a current supply source and said voltage divider and also at least one conductively poled diode, the number thereof being designated n, connected between said voltage divider and a second pole of said current supply means, at least one of said last mentioned diodes being a dual-function diode by virtue of being also connected in cascade with said Zener diode(s) and counting also as one of said first mentioned group of conductively poled diodes, the number of which is designated l, which method comprises the steps of: making a source of reference voltage having components as above set forth in such a way as to approximate a design criterion of
Claim 15
Dependent Claim
102 words
A method as defined in claim 12 in which the aforesaid step preceding the step of modifying voltage divider resistance values is carried out by constituting a circuit in which at least one aforesaid dual-function diode is connected between the pole of the current source from which the output voltage at the voltage divider tap is measured and a function at which the current through said Zener diode(s) joins the current through said shunt circuit, said dual-function diode being counted both as one of the diodes determining the said number l and as one of the diodes determining the said number n.
Claim 16
Dependent Claim
61 words
A method as defined in claim 13 in which the aforesaid step preceding the step of modifying voltage divider resistance values is carried out by providing for the occurrence of a voltage drop UDo across the conductively poled diodes and for a temperature coefficient AD of the conductively poled diodes so chosen by reference to the current density that the condition
Claim 17
Dependent Claim
49 words
A method as defined in claim 13 in which the aforesaid step preceding the step of modifying voltage divider resistance values is carried out by constituting a circuit in which the number of diodes in the two parallel circuits designated by l, k, m and n satisfies the condition
Claim 18
Dependent Claim
32 words
A method as defined in claim 13 in which said voltage divider is trimmed progressively by removal of portions of the resistors of said voltage divider at least in part by sandblasting.
Claim 19
Dependent Claim
34 words
A method as defined in claim 13 in which said voltage divider is trimmed progressively by removal of portions of the resistors of said voltage divider at least in part by laser beam cutting.
Claim 20
Dependent Claim
33 words
A method as defined in claim 13 in which said voltage divider is trimmed progressively by modification of portions of the resistors of said voltage divider at least in part by electrochemical action.
Claim 21
Dependent Claim
40 words
A method as defined in claim 13 in which a reference voltage source is produced in monolithic integrated circuit form and in which the trimming of said voltage divider (R1, R2) is carried out on a monolithic integrated circuit chip.
Claim 22
Dependent Claim
27 words
A method as defined in claim 19 in which said voltage divider (R1, R2) is trimmed during the premeasurement of the chip on a wafer test equipment.
Claim 23
Dependent Claim
58 words
A method as defined in claim 13 in which at least one of the resistors (R1, R2) constituting said voltage divider is subdivided into at least two resistor portions for purposes of trimming and that the trimming step is carried out by the interruption of at least one conduction path by which said resistor portions were originally interconnected.
Claim 24
Dependent Claim
46 words
A method of manufacture as defined in claim 21 in which the resistance values of said resistor portions utilized in the trimming step are related to each other in the progressive ratio 1 : 2 : 4 : 8 : 16 : 32 : ... .
Claim 25
Dependent Claim
112 words
A method as defined in claim 13 in which the step of trimming a voltage divider is performed with a voltage regulator connected with said source of reference voltage as made prior to the trimming step, so as to form a voltage stabilizer together, said voltage stabilizer providing a stabilized output voltage UA at the output of a second voltage divider (R3, R4), and in which the desired stabilized voltage UA is obtained by variation of the first voltage divider (R1, R2) in the completion of the manufacture of the source of reference voltage as aforesaid, and in which, further, the second voltage divider (R3, R4) has a resistance ratio defined as
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |