Radio receiver in CMOS integrated circuit

A radio receiver formed as a monolithic integrated circuit comprising:

• a superheterodyne receiver having an input coupled to an input of said integrated circuit, said receiver including an intermediate frequency (IF) filter for providing an IF filtered output;
• a demodulator receiving said IF filtered output and outputting a digital data signal, said demodulator including a baseband filter;
• and
• an automatic gain control circuit receiving a feedback signal from said superheterodyne receiver and controlling a gain of said IF filtered output;
• said superheterodyne receiver, said automatic gain control circuit and said demodulator being formed on a single monolithic integrated circuit chip using CMOS transistors, said intermediate frequency filter and said baseband filter being formed entirely on said monolithic integrated circuit.

A radio receiver formed as a monolithic integrated circuit comprising:

• a superheterodyne receiver having an input coupled to an antenna input of said integrated circuit, said receiver including an intermediate frequency (IF) filter for providing an IF filtered output;
• a demodulator receiving said IF filtered output and outputting a digital data signal, said demodulator including a baseband filter, wherein said digital data signal has a DC component;
• and
• a terminal configured for connection to an external capacitor, said external capacitor forming part of a low-pass filter to filter out said DC component of said digital data signal;
• said superheterodyne receiver and said demodulator both being formed on a single monolithic integrated circuit chip using CMOS transistors, said intermediate frequency filter and said baseband filter being formed entirely on said monolithic integrated circuit.

A monolithic integrated circuit comprising:

• a radio receiver having an input coupled to an input of said integrated circuit and an output providing a filtered output;
• a demodulator receiving said filtered output and outputting a digital data signal, said demodulator including a baseband filter;
• and
• an automatic gain control circuit receiving a feedback signal from said radio receiver and controlling a gain of said filtered output;
• said radio receiver, said automatic gain control circuit and said demodulator all being formed on a single monolithic integrated circuit chip using CMOS transistors and no bipolar transistors.