05625327 is referenced by 30 patents and cites 16 patents.

A Colpitts-type oscillator circuit suitable for use with electronic identification systems is disclosed. The oscillator circuit utilizes a pair of transistors coupled together with a feedback loop that includes a parallel LC circuit such that the output amplitude can be as high as a factor of 20 times the supply voltage or more while maintaining a high Q, low distortion output. The oscillator circuit is a modified Colpitts oscillator that includes a NPN transistor and a PNP transistor coupled together and a Colpitts type feedback loop containing a parallel LC circuit. The capacitance of the parallel LC circuit consists of at least two capacitors in series forming a capacitive divider which provides a low impedance feedback via the base of the NPN transistor into the emitter of the PNP transistor. The collector of the PNP transistor taps into the inductor of the parallel LC circuit such that the inductor is driven to resonance.

Title
Modified Colpitts oscillator for driving an antenna coil and generating a clock signal
Application Number
8/502313
Publication Number
5625327
Application Date
July 13, 1995
Publication Date
April 29, 1997
Inventor
J Donald Pauley
Estes Park
CO, US
Gary T Carroll
Boulder
CO, US
Agent
Fitch Even Tabin & Flannery
Assignee
GnuCo Technology Corporation
CO, US
IPC
H03B 5/12
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