4X crystal frequency multiplier with op amp buffer between...

Details 4X crystal frequency multiplier with op amp buffer between... 4X crystal frequency multiplier with op amp buffer between...

2006-05-30

2006-05-30

Chang, Joseph (Department: 2817)

Oscillators

Electromechanical resonator

Vibrating reed or string type

Reexamination Certificate

active

07053725

ABSTRACT:
A frequency-multiplying circuit generates a multiple of the fundamental frequency of a crystal that oscillates. A first differential multiplier is coupled to the crystal nodes and generates a frequency-doubled output. The frequency-doubled output is applied to an op amp that buffers the output and compares it to a reference to generate a pair of differential buffered signals. The differential buffered signals are applied to a second differential multiplier that generates a final quadrupled-frequency output. The differential multipliers can each have a pair of differential transistors that receive signals that oscillate out-of-phase to each other by 180 degrees. The drains of the differential transistors connect together at a summing node to sum the transistor currents, producing the frequency-doubled output. A crystal driver circuit using cross-coupled and direct-coupled transistors may also be attached to the crystal nodes.

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