Patent ID: 8514028
Filing Date: 2013-08-20
Classification: H03B,H04L

Abstract:
1. A voltage controlled oscillator (VCO) comprising: an LC tank circuit; a pair of cross coupled semiconductor devices, each semiconductor device comprising a field effect transistor (FET) with an independently controlled body, the FETs being cross coupled and said LC tank circuit being connected to the gates of the cross coupled FETs; a pair of buffers, the input to each buffer being directly connected to said body of a respective said FET, wherein each said body is a surface well; a first pair of resistors, each connected between a supply voltage and a second well, one said surface well being in said second well; and a second pair of resistors, each connected between a second control voltage and another said surface well, wherein said LC tank circuit is coupled to each of said buffers solely through capacitance between the respective FET drain and the respective said surface well.