Patent ID: 7636386

Claim:
A modulating circuit comprising: a. a phase control loop to output an analog angle modulation signal in response to an input desired angle modulation signal, wherein the phase control loop includes: i. a difference logic circuit to receive as input a first bit stream representing the desired angle modulation signal and a second bit stream representing the analog angle modulation signal and to output an output bit stream representing a difference quantity between the first bit stream and the second bit stream; and ii. a controlled oscillator to output the analog angle modulation signal; and b. a modulating loop coupled to receive the output bit stream from the difference logic circuit and coupled to an input terminal of the controlled oscillator, wherein the modulation loop includes: i. a modulation gain circuit, including a gate circuit to adjust the output bit stream and an accumulator to generate a gain parameter based on the output bit stream adjusted by the gate circuit, to automatically output the generated gain parameter; and ii. a multiplier to receive as input the gain parameter and as input the first input bit stream representing the desired angle modulation signal and to output a calibrating modulation signal to the input terminal of the controlled oscillator.