Patent ID: 7132900
Filing Date: 2006-11-07
Classification: H01L,H03C

Abstract:
1. A high frequency semiconductor circuit device which comprises: a transmission oscillator which outputs differential signals; a first external terminal for outputting either of differential signals generated at the transmission oscillator; an amplitude detection circuit which compares the amplitude of a reference signal with the amplitude of a feedback signal and generates a signal corresponding to the amplitude difference; a second external terminal for receiving externally supplied signals; a signal synthesis circuit which combines a signal inputted to the second external terminal with a signal of a predetermined frequency; and an equivalent impedance circuit having an impedance equivalent to the impedance between one output terminal of said transmission oscillator and said first external terminal, wherein one output terminal of said transmission oscillator of differential output configuration and said first external terminal are connected with each other through a first bonding wire, and the other output terminal of said transmission oscillator and one terminal of said equivalent impedance circuit are connected with each other through a second bonding wire, so that one output of the differential signals is outputted externally of the high frequency semiconductor circuit device via said first external terminal and the other output of the differential signals is provided to the equivalent impedance circuit included in the high frequency semiconductor circuit device.