Patent ID: 7127219
Filing Date: 2006-10-24
Classification: H03G

Abstract:
1. A transmitter outputting a microwave signal, comprising: a circuit for making constant a level of an input intermediate frequency signal; and a frequency converting circuit frequency-converting the intermediate frequency signal of which level is made constant by said circuit for making constant the level, to said microwave signal, wherein the detection is made at a point between the circuit and the frequency converting circuit, wherein said circuit for making constant the level of the input intermediate frequency signal includes wherein said variable attenuation circuit includes a PIN diode having each amount of attenuation changed as terminal to terminal resistance changes in accordance with the comparison output signal from said comparing circuit, wherein said detecting circuit includes a detecting diode rectifying an output signal of said variable attenuation circuit, a capacitor smoothing the rectified output signal to provide a DC signal, and a resistance outputting the rectified DC signal, and wherein said reference voltage generating circuit includes a plurality of resistance circuits.