Programmable ask demodulator

An amplitude shift keying (ASK) demodulator for demodulating an input signal, comprising:

• a frequency filter configured to receive the input signal, wherein the frequency filter includes adjustable components configured to variably adjust a frequency response of the frequency filter in response to a first set of varying digital codes;
• a rectifier configured to rectify an output of the frequency filter, wherein the rectifier includes an adjustable current source configured to variably adjust a current consumption of the rectifier in response to a second set of varying digital codes;
• a reference signal generator configured to produce a reference signal;
• a current to voltage converter configured to convert a current of a rectified signal to a rectified voltage and to convert a current of the reference signal to a reference voltage further comprising:
• a first transistor having a first terminal connected to a voltage supply and a second terminal connected to the rectifier;
• a second transistor having a first terminal connected to the voltage supply and a second terminal connected to the reference signal generator;
• and
• a capacitor connected between the second terminal of the first transistor and the second terminal of the second transistor;
• a first current mirror having a third transistor and fourth transistor connected between the voltage supply and ground, wherein the third transistor is a scaled version of the first transistor with a scale factor of n and wherein the control terminal for the third transistor is connected to the control terminal of the first transistor;
• a second current mirror having a fifth transistor and sixth transistor connected between the voltage supply and ground, wherein the fifth transistor is a scaled version of the second transistor with the scale factor of n, wherein the control terminal for the fifth transistor is connected to the control terminal of the second transistor, and wherein a control terminal of the sixth transistor is connected to a control terminal of the fourth transistor;
• and
• a buffer configured to produce a demodulated output signal based upon a current difference between the first and second current mirrors.

An amplitude shift keying (ASK) demodulator for demodulating an input signal, comprising:

• a frequency filter configured to receive the input signal, wherein the frequency filter includes adjustable components configured to variably adjust a frequency response of the frequency filter in response to a first set of varying digital codes;
• a rectifier configured to rectify an output of the frequency filter, wherein the rectifier includes an adjustable current source configured to variably adjust a current consumption of the rectifier in response to a second set of varying digital codes;
• a reference signal generator configured to produce a reference signal;
• a current to voltage converter configured to convert the current of the rectified signal to a rectified voltage and to convert the current of the reference signal to a reference voltage;
• and
• a comparator configured to compare the rectified voltage to the reference voltage and to produce a demodulated output signal.