Programmable digital intermediate frequency transceiver

A monolithic CMOS programmable digital intermediate frequency transceiver, comprising:

• a programmable memory receiving and storing a first value, a second value, a third value, a fourth value and a fifth value, the first value being representative of a programmable parameter k, the second value representative of programmable parameter N, the third value being representative of a programmable parameter G, the fourth value being representative of a programmable parameter B, the fifth value being representative of a programmable parameter L;
• a clock generator coupled to the programmable memory, the clock generator generating first, second, third, fourth, fifth and sixth clock signals, the first clock signal having a first frequency, fl, the second clock signal having a second frequency approximately equal to fl/k, the third clock signal having a third frequency approximately equal to fl/N, the fourth clock signal having a fourth frequency approximately equal to fl/B, the fifth clock signal having a fifth frequency approximately equal to fl/GB, and the sixth clock signal having a sixth frequency approximately equal to fl/L;
• a receiver receiving an analog input signal having a first intermediate frequency, the receiver comprising:
• a sigma delta converter sampling the analog input signal using the first clock signal to generate a first set of digital signals;
• a digital downconverter mixing down the first set of digital signals using the second clock signal to generate a second set of digital signals;
• a decimation filter network filtering the second set of digital signals using the third clock signal to generate a third set of digital signals;
• a transmitter transmitting an analog output signal having a second intermediate frequency, the transmitter comprising:
• a digital interpolator network interpolating a fourth set of digital signals using the fourth and fifth clock signals to generate a fifth set of digital signals;
• a digital quadrature modulator mixing up the fifth set of digital signals using the sixth clock signal to generate a sixth set of digital signals;
• and
• a digital-to-analog converter converting the sixth set of digital signals into the analog output signal.

A method of receiving an analog input signal having an intermediate frequency using a CMOS programmable digital intermediate frequency receiver, the method comprising:

• receiving and storing a first value representative of a programmable parameter k and a second value representative of programmable parameter N;
• generating a first clock signal having a first frequency, fl, a second clock signal having a second frequency approximately equal to fl/k, and a third clock signal having a third frequency approximately equal to fl/N;
• sampling the analog input signal having an intermediate frequency using a sigma delta converter and the first clock signal to generate a first set of digital signals;
• mixing down the first set of digital signals using the second clock signal to generate a second set of digital signals;
• and
• filtering the second set of digital signals using the third clock signal to generate a third set of digital signals.

A method of receiving and transmitting analog IF signals using a monolithic CMOS programmable digital intermediate frequency transceiver, the method comprising:

• receiving and storing a first value, a second value, a third value, a fourth value and a fifth value, the first value being representative of a programmable parameter k, the second value representative of programmable parameter N, the third value being representative of a programmable parameter G, the fourth value being representative of a programmable parameter B, the fifth value being representative of a programmable parameter L;
• generating first, second, third, fourth, fifth and sixth clock signals, the first clock signal having a first frequency, fl, the second clock signal having a second frequency approximately equal to fl/k, the third clock signal having a third frequency approximately equal to fl/N, the fourth clock signal having a fourth frequency approximately equal to fl/B, the fifth clock signal having a fifth frequency approximately equal to fl/GB, and the sixth clock signal having a sixth frequency approximately equal to fl/L;
• sampling an analog input signal having a first IF frequency using a sigma delta converter and the first clock signal to generate a first set of digital signals;
• mixing down the first set of digital signals using the second clock signal to generate a second set of digital signals;
• filtering the second set of digital signals using the third clock signal to generate a third set of digital signals;
• interpolating a fourth set of digital signals using the fourth and fifth clock signals to generate a fifth set of digital signals;
• mixing up the fifth set of digital signals using the sixth clock signal to generate a sixth set of digital signals;
• and
• converting the sixth set of digital signals into an analog output signal having a second IF frequency.

A monolithic CMOS programmable digital intermediate frequency transmitter, comprising:

• a programmable memory receiving and storing a first value, a second value, and a third value, the first value being representative of a programmable parameter G, the second value being representative of a programmable parameter B, the third value being representative of a programmable parameter L;
• a clock generator coupled to the programmable memory, the clock generator generating first, second, and third clock signals, the first clock signal having a first frequency approximately equal to fl/B, the second clock signal having a second frequency approximately equal to fl/GB, and the third clock signal having a third frequency approximately equal to fl/L;
• a digital interpolator network interpolating a first set of digital signals using the first and second clock signals to generate a second set of digital signals;
• a digital quadrature modulator mixing up the second set of digital signals using the third clock signal to generate a third set of digital signals;
• and
• a digital-to-analog converter converting the third set of digital signals into an analog output signal.