Joseph P. Heck

Dual conversion FM receiver using phase locked direct conversion IF

Zero intermediate frequency receiver having an automatic gain control circuit

Zero intermediate frequency noise blanker

Direct current (DC) offset compensation method and apparatus

Generating transmit injection from receiver first and second injections

Integratable DC blocking circuit

Two-port synthesizer modulation system employing an improved reference phase modulator

Balanced mixer circuit with improved linearity

Dual port FM demodulation in phase locked receivers

Method and apparatus providing improved intermodulation distortion protection