RF tuning circuit which provides image frequency rejection

摘要: A radio frequency tuning circuit, for use in a transmitter or receiver, which rejects image frequencies of the band supplied RF signal to it is tuned. The circuit comprises an N-path filter and feedback loop connecting output such input amplifier applied. includes tunable local oscillator pair quadrature related paths including mixers therein driven by oscillator, outputs being combined summing produces signal. also path, causing center transfer characteristic be displaced from frequency. thereby substantially only single sideband signals produced two paths.