Device operable with an excellent spectrum suppression

Claim 1

A device for use in processing a baseband input signal and a carrier signal into an envelope output signal, said device comprising: modulating means for modulating said carrier signal with said baseband input signal to produce an output signal; means for generating a burst control signal; switching means supplied with said burst control signal for switching said modulating means on and off such that said modulating means produces said output signal when said modulating means is switched on and a non-modulated signal when said modulating means is switched off, wherein said carrier signal and said baseband input signal are modulated only when said modulating means is switched on in response to said switching means; waveform generating means responsive to said burst control signal for generating a control signal; and amplifying means supplied with said control signal and said output signal for amplifying said output signal to a power range determined by said control signal to generate said envelope output signal.

Claim 2

A device for use in processing a baseband input signal and a carrier signal into an envelope output signal, said device comprising: modulating means for modulating said carrier signal with said baseband input signal to produce an output signal; means for generating a burst control signal; switching means supplied with said burst control signal for switching said modulating means on and off such that said modulating means produces said output signal when said modulating means is switched on and a non-modulated signal when said modulating means is switched off, wherein said carrier signal and said baseband input signal are modulated only when said modulating means is switched on in response to said switching means; waveform generating means responsive to said burst control signal for generating a control signal; and amplifying means supplied with said control signal and said output signal for amplifying said output signal to a power range determined by said control signal to generate said envelope output signal.

Claim 3

A device for use in processing a baseband input signal and a carrier signal into an envelope output signal, said device comprising: modulating means for modulating said carrier signal with said baseband input signal to produce an output signal; means for generating a burst control signal; waveform generating means responsive to said burst control signal for generating a control signal, wherein said control signal includes sloping leading and trailing edges and a plateau region between said sloping leading and trailing edges; switching means supplied with said control signal for switching said modulating means on and off such that said modulating means produces said output signal when said modulating means is switched on and a non-modulated signal when said modulating means is switched off, wherein said switching means switches said modulating means off during a time interval corresponding to said sloping leading and trailing edges of said control signal and switches said modulating means on during a time interval corresponding to said plateau region of said control signal, such that modulation occurs only during said time interval corresponding to said plateau region of said control signal; and amplifying means supplied with said control signal and said output signal for amplifying said output signal to a power range determined by said control signal to generate said envelope output signal.

Claim 4

A device for use in processing a baseband input signal and a carrier signal into an envelope output signal, said device comprising: modulating means for modulating said carrier signal with said baseband input signal to produce an output signal; means for generating a burst control signal; waveform generating means responsive to said burst control signal for generating a control signal, wherein said control signal includes sloping leading and trailing edges and a plateau region between said sloping leading and trailing edges; switching means supplied with said control signal for switching said modulating means on and off such that said modulating means produces said output signal when said modulating means is switched on and a non-modulated signal when said modulating means is switched off, wherein said switching means switches said modulating means off during a time interval corresponding to said sloping leading and trailing edges of said control signal and switches said modulating means on during a time interval corresponding to said plateau region of said control signal, such that modulation occurs only during said time interval corresponding to said plateau region of said control signal; and amplifying means supplied with said control signal and said output signal for amplifying said output signal to a power range determined by said control signal to generate said envelope output signal.

Claim 5

A device comprising: modulating means for modulating a carrier signal with a baseband signal to produce a modulated carrier signal during an on-state, said modulating means producing a non-modulated carrier signal during an off-state; means for generating a burst control signal; means responsive to said burst control signal for generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; means responsive to said waveform control signal for amplifying said modulated carrier signal and said non-modulated carrier signal to produce an amplified signal having an envelope defined by a waveform of said waveform control signal; and means responsive to said waveform control signal for switching said modulating means off during said sloping leading edge and said sloping trailing edge of said waveform control signal, and switching said modulating means on during said plateau region of said waveform control signal.

Claim 6

A device comprising: modulating means for modulating a carrier signal with a baseband signal to produce a modulated carrier signal during an on-state, said modulating means producing a non-modulated carrier signal during an off-state; means for generating a burst control signal; means responsive to said burst control signal for generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; means responsive to said waveform control signal for amplifying said modulated carrier signal and said non-modulated carrier signal to produce an amplified signal having an envelope defined by a waveform of said waveform control signal; and means responsive to said waveform control signal for switching said modulating means off during said sloping leading edge and said sloping trailing edge of said waveform control signal, and switching said modulating means on during said plateau region of said waveform control signal.

Claim 7

A method for controlling a spectrum of a burst transmission signal, said method comprising the steps of: generating a burst control signal; generating in response to said burst control signal a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; generating in response to said burst control signal a switch-on signal and a switch-off signal, wherein said switch-on signal and said switch-off signal are supplied to a modulating means; producing a modulated carrier signal from a carrier signal and a baseband signal in response to said switch-on signal, and producing a non-modulated carrier signal in response to said switch-off signal; and amplifying said modulated and said non-modulated carrier signals in response to said waveform control signal to produce as said burst transmission signal an amplified signal having an envelope defined by a waveform of said waveform control signal.

Claim 8

A method for controlling a spectrum of a burst transmission signal, said method comprising the steps of: generating a burst control signal; generating in response to said burst control signal a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; generating in response to said burst control signal a switch-on signal and a switch-off signal, wherein said switch-on signal and said switch-off signal are supplied to a modulating means; producing a modulated carrier signal from a carrier signal and a baseband signal in response to said switch-on signal, and producing a non-modulated carrier signal in response to said switch-off signal; and amplifying said modulated and said non-modulated carrier signals in response to said waveform control signal to produce as said burst transmission signal an amplified signal having an envelope defined by a waveform of said waveform control signal.

Claim 9

A method for controlling a spectrum of a burst transmission signal, said method comprising the steps of: generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; generating in response to said waveform control signal a switch-on signal during a period of time corresponding to said plateau region of said waveform control signal and generating a switch-off signal during a period of time corresponding to a duration of each of said sloping leading edge and said sloping trailing edge, wherein said switch-on signal and said switch-off signal are supplied to a modulating means; generating a modulated carrier signal in response to said switch-on signal, and generating a non-modulated signal in response to said switch-off signal; and amplifying said modulated and said non-modulated carrier signals in response to said waveform control signal to produce as said burst transmission signal an amplified signal having an envelope defined by a waveform of said waveform control signal.

Claim 10

A method for controlling a spectrum of a burst transmission signal, said method comprising the steps of: generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; generating in response to said waveform control signal a switch-on signal during a period of time corresponding to said plateau region of said waveform control signal and generating a switch-off signal during a period of time corresponding to a duration of each of said sloping leading edge and said sloping trailing edge, wherein said switch-on signal and said switch-off signal are supplied to a modulating means; generating a modulated carrier signal in response to said switch-on signal, and generating a non-modulated signal in response to said switch-off signal; and amplifying said modulated and said non-modulated carrier signals in response to said waveform control signal to produce as said burst transmission signal an amplified signal having an envelope defined by a waveform of said waveform control signal.

Claim 11

A device comprising: a modulating circuit for modulating a carrier signal with a baseband signal to produce a modulated carrier signal during an on-state, said modulating circuit producing a non-modulated carrier signal during an off-state; a waveform generating unit for generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; an amplifying unit responsive to said waveform control signal for amplifying said modulated and said non-modulated carrier signals to produce an amplified signal having an envelope defined by a waveform of said waveform control signal; and a switching circuit for switching said modulating circuit off during a time corresponding to a duration of each of said sloping leading edge and said sloping trailing edge of said waveform control signal and for switching said modulating circuit on during a time period corresponding to said plateau region of said waveform control signal.

Claim 12

A device comprising: a modulating circuit for modulating a carrier signal with a baseband signal to produce a modulated carrier signal during an on-state, said modulating circuit producing a non-modulated carrier signal during an off-state; a waveform generating unit for generating a waveform control signal having a sloping leading edge and a sloping trailing edge and a plateau region between said sloping leading edge and said sloping trailing edge; an amplifying unit responsive to said waveform control signal for amplifying said modulated and said non-modulated carrier signals to produce an amplified signal having an envelope defined by a waveform of said waveform control signal; and a switching circuit for switching said modulating circuit off during a time corresponding to a duration of each of said sloping leading edge and said sloping trailing edge of said waveform control signal and for switching said modulating circuit on during a time period corresponding to said plateau region of said waveform control signal.