Patent ID: 6125270
Filing Date: 2000-09-26
Classification: H04B

Abstract:
A receiver comprising:(a) a frequency generator that provides an output a.c. signal at a first predetermined frequency, wherein said frequency generator comprises:(i) a Colpitt generator responsive to a frequency source having a preselected frequency and operating on a third overtone of said preselected frequency and generating an output thereof; and(ii) a frequency doubler receiving the output of said Colpitt generator and generating said output a.c. signal of said frequency generator(b) an antenna for receiving a RF signal having a second predetermined frequency and providing an output thereof;(c) an RF amplifier having a first automatic gain control (AGC) circuit and first and second inputs and generating an output signal, said first input being connected to said output of said antenna and the second input being connected to receive a signal to which said first AGC circuit is responsive;(d) a mixer having first and second inputs with the first input connected to the output of said frequency generator and the second input connected to the output of said RF amplifier, said mixer generating an intermediate frequency (IF) signal having a frequency which represents the difference between said first and second predetermined frequencies;(e) an IF amplifier having a second automatic gain control (AGC) circuit and first and second inputs and generates an output signal, said first input being connected to said output of said mixer and the second input being connected to receive a signal to which said second AGC circuit is responsive; and(f) a video detector connected to said output of said IF amplifier and generating an output amplitude modulated (AM) demodulated signal with a corresponding amplitude and having a d.c. component that is proportional to the said corresponding amplitude, said output of said video detector connected to said second input of each of said RF and IF amplifiers.