Dual conversion FM receiver using phase locked direct conversion IF

摘要: A receiver for frequency modulated signals, having down-conversion to a baseband, zero intermediate selectivity, followed by up-conversion non-zero IF amplification, limiting, and demodulation. phase-lock loop locks the of source center signal coupled baseband IF, converting precisely frequency. This avoids beat note often found in direct conversion systems. The additionally provides inherent demodulation FM signal. received is through radio amplifier improved sensitivity local oscillator isolation, or first comprising mixer, oscillator, filter, amplifier.