초록 ▼

An oscillator circuit having improved long term and short term phase stability. A source follower provides a signal to a bipolar transistor. The bipolar transistor is fed with a current from a current mirror which may be selectively controlled. A piezoelectric crystal and a high resistance element a

An oscillator circuit having improved long term and short term phase stability. A source follower provides a signal to a bipolar transistor. The bipolar transistor is fed with a current from a current mirror which may be selectively controlled. A piezoelectric crystal and a high resistance element are connected in parallel from the collector of the bipolar transistor to the input of the source follower. The drive voltage to the piezoelectric crystal is controlled by the current mirror to improve long term frequency stability.

대표청구항 ▼

[ What is claimed is:] [1.]1. An oscillator circuit comprising:source follower circuit having an input, and an output providing a source of low impedance current;a current source,a bipolar transistor having a base connected to said source follower output, and a collector-emitter circuit serially con

[ What is claimed is:] [1.]1. An oscillator circuit comprising:source follower circuit having an input, and an output providing a source of low impedance current;a current source,a bipolar transistor having a base connected to said source follower output, and a collector-emitter circuit serially connected to said current source for passing a current from said current source;feedback means for supplying a d.c. voltage to said source follower input from said bipolar transistor; anda frequency control element connected between said bipolar transistor collector and said source follower input which establishes a loop gain and phase for producing oscillations which are amplitude controlled by a current level set by said current source.