Patent ID: 6169459
Filing Date: 2001-01-02
Classification: H03B

Abstract:
An active bridge oscillator comprising: a differential amplifier having an inverting input on a first gain device and a noninverting input on a second gain device, said devices each having a transconductance g.sub.m and inverting and noninverting outputs, said non-inverting outputs being connected as a coupled pair; a signal conditioning circuit connecting the inverting output of said first gain device to the noninverting input; a negative feedback path comprising a feedback resistance connected between said inverting and noninverting inputs, and a resonant circuit having a series resistance connected from said inverting input to ac ground; a positive feedback path consisting of the intrinsic resistance 1/g.sub.m of the gain devices and a relatively low ac resistance connected between said coupled pair and ac ground, the magnitude of said resistance being on the order of the sum of 1/g.sub.m of both gain devices.