US 6,298,093 B1 · Apparatus and method for phase and frequency digital modulation · patentgrep

Loading patent…

Abstract

Apparatus for phase/frequency digital modulation includes a digital circuit receiving and processing a digital modulation input signal to generate a digital modulation control signal, a digital-to-analog converter coupled to the digital circuit converts the digital modulation control signal into an analog modulation control signal, and an RF/analog circuit is coupled to the digital-to-analog converter. The RF/analog circuit includes a voltage controlled oscillator to generate a modulated output signal in response to the analog modulation control signal, and a quadrature tuner coupled to the voltage controlled oscillator generates an in-phase tuner output and a quadrature tuner output in response to the modulated output signal. An analog-to-digital converter is coupled to the quadrature tuner and converts the in-phase tuner output and the quadrature tuner output to digital in-phase and quadrature tuner outputs. The digital in-phase tuner output and the quadrature tuner output are fed back to the digital circuit to generate the digital modulation control signal.

Claims42

Dependent claims

Apparatus for phase/frequency digital modulation, comprising:

a digital circuit receiving and processing a digital modulation input signal to generate a digital modulation control signal;
a digital-to-analog converter coupled to the digital circuit for converting the digital modulation control signal into an analog modulation control signal;
and
an RF/analog circuit coupled to the digital-to-analog converter, the RF/analog circuit comprising:
a voltage controlled oscillator generating a modulated output signal in response to the analog modulation control signal;
a quadrature tuner coupled to the voltage controlled oscillator generates an in-phase tuner output and a quadrature tuner output in response to the modulated output signal;
an analog-to-digital converter coupled to the quadrature tuner to convert the in-phase and quadrature tuner outputs to digital in-phase and quadrature tuner outputs, the digital in-phase and quadrature tuner outputs fed back to the digital circuit to generate the digital modulation control signal;
and
a coordinate transformer coupled to the analog-to-digital converter for converting the in-phase and quadrature tuner outputs to a phase signal and an amplitude signal separately.

6 more elements

Apparatus for phase/frequency digital modulation, comprising:

a digital circuit receiving a modulation input signal and generating a modulation control signal;
an RF/analog circuit coupled to the digital circuit and receiving the modulation control signal, the RF/analog circuit comprising:
a voltage controlled oscillator generating a modulated output signal in response to the modulation control signal;
and
a quadrature tuner coupled to the voltage controlled oscillator to generate an in-phase tuner output and a quadrature tuner output in response to the modulation control signal;
a coordinate transformer coupled to the quadrature tuner to convert the in-phase and quadrature tuner outputs to a phase signal and an amplitude signal;
and
wherein the digital circuit comprises:
a deviation calibration loop receiving a phase modulation input signal and the phase signal from the coordinate transformer to compare the phase modulation input signal and the phase signal to generate a deviation control output;
a multiplier coupled to the deviation calibration loop to multiply the phase modulation input signal by the deviation control output to generate a multiplier output;
and
a summer coupled to the multiplier and the coordinate transformer to receive and sum the multiplier output and the phase signal to generate the modulation control signal.

9 more elements

Apparatus for phase/frequency digital modulation, comprising:

a digital circuit receiving a modulation input signal and generating a modulation control signal;
an RF/analog circuit coupled to the digital circuit and receiving the modulation control signal, the RF/analog circuit comprising:
a voltage controlled oscillator generating a modulated output signal in response to the modulation control signal;
and
a quadrature tuner coupled to the voltage controlled oscillator to generate an in-phase tuner output and a quadrature tuner output in response to the modulation control signal;
a coordinate transformer coupled to the quadrature tuner to convert the in-phase and quadrature tuner outputs to a phase signal and an amplitude signal;
and
wherein the digital circuit comprises:
a backward difference circuit coupled to the coordinate transformer to generate a frequency signal in response to the phase signal;
a deviation calibration loop receiving a digital frequency modulation input signal and the frequency signal and generating a deviation output;
a multiplier coupled to the deviation calibration loop to multiply the frequency modulation input signal by the deviation output to generate a multiplier output;
and
a summer coupled to the multiplier and the coordinate transformer to receive and sum the multiplier output and the phase signal to generate the modulation control signal applied to the voltage controlled oscillator.

10 more elements

Apparatus for phase/frequency digital modulation, comprising:

a digital circuit receiving and processing a digital modulation input signal to generate a digital modulation control signal;
a digital-to-analog converter coupled to the digital circuit for converting the digital modulation control signal into an analog modulation control signal;
an RF/analog circuit coupled to the digital-to-analog converter, the RF/analog circuit comprising:
a voltage controlled oscillator generating a modulated output signal in response to the analog modulation control signal;
a quadrature tuner coupled to the voltage controlled oscillator to generate an in-phase tuner output and a quadrature tuner output in response to the modulated output signal;
an analog-to-digital converter coupled to the quadrature tuner to convert the in-phase and quadrature tuner outputs to digital in-phase and quadrature tuner outputs, the digital in-phase and quadrature tuner outputs fed back to the digital circuit to generate the digital modulation control signal;
and
a coordinate transformer coupled to the analog-to-digital converter for converting the in-phase and quadrature tuner outputs to a phase signal and an amplitude signal;
wherein the digital circuit further comprises:
a deviation calibration loop receiving a digital phase modulation input signal and the phase signal from the coordinate transformer to compare the digital phase modulation input signal and the phase signal to generate a deviation control output;
a multiplier coupled to the deviation calibration loop to multiply the digital phase modulation input signal by the deviation control signal to generate a multiplier output;
and
a summer coupled to the multiplier and the coordinate transformer to receive and sum the multiplier output and the phase signal to generate the digital modulation control signal supplied to the digital-to-analog converter.

10 more elements

Apparatus for phase/frequency digital modulation, comprising:

a digital circuit receiving and processing a digital modulation input signal to generate a digital modulation control signal;
a digital-to-analog converter coupled to the digital circuit for converting the digital modulation control signal into an analog modulation control signal;
an RF/analog circuit coupled to the digital-to-analog converter, the RF/analog circuit comprising:
a voltage controlled oscillator generating a modulated output signal in response to the analog modulation control signal;
a quadrature tuner coupled to the voltage controlled oscillator to generate an in-phase tuner output and a quadrature tuner output in response to the modulated output signal;
an analog-to-digital converter coupled to the quadrature tuner to convert the in-phase and quadrature tuner outputs to digital in-phase and quadrature tuner outputs, the digital in-phase and quadrature tuner outputs fed back to the digital circuit to generate the digital modulation control signal;
and
a coordinate transformer coupled to the analog-to-digital converter for converting the digital in-phase and quadrature tuner outputs to a phase signal and an amplitude signal;
wherein the digital circuit comprises:
a backward difference circuit coupled to the coordinate transformer and generating a frequency signal from the phase signal;
a deviation calibration loop receiving and comparing a digital frequency modulation input signal and the frequency signal to generate a deviation output in response thereto;
a multiplier coupled to the deviation calibration loop to multiply the digital frequency modulation input signal by the deviation output to generate a multiplier output;
and
a summer coupled to the multiplier and the coordinate transformer to receive and sum the multiplier output and the phase signal to generate the digital modulation control signal applied to the digital-to-analog converter.

11 more elements

Dependencies are inferred from the claim text.