Meacham Bridge Oscillator

This Meacham-light bulb stabilized, low-distortion, low-noise 5-kHz Wien-bridge sinusoidal oscillator’s RC feedback network attenuates by a factor of 3 at its midband. The bulb’s self-heating forces a gain of 3 in the op amp.

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The Meacham bridge oscillator The earliest known attempt to eliminate active device tempco in crystal oscillators was the bridge-stabilized circuit described by Meacham in 1938 [4, 7] . In the Meacham bridge oscillator, the crystal replaces one of the resistors in a wheatstone bridge (fig. 4). The bridge is connected so as

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The Meacham Bridge Oscillator The first known attempt to eliminate active de-vice tempco in crystal oscillators was the bridge-stabilized circuit described by Meacham in 1938 [4, 7] . In the Meacham bridge oscillator, the crystal replaces one of the resistors in a Wheatstone bridge (fig 4). The bridge is connected so as to provide negative …

Meacham disclosed the bridge oscillator circuit shown to the right in 1938. The circuit was described as having very high frequency stability and very pure sinusoidal output. [9] Instead of using tube overloading to control the amplitude, Meacham proposed a circuit that set the loop gain to unity while the amplifier is in its linear region.

The bridge stabilised Meacham oscillator given in Fig. 19.2 is a constant frequency oscillator of very high stability. It consists of a Wheatstone’s bridge and an amplifier section. One of the four bridge arms is a thermally controlled resistance element, two of the arms are fixed resistances, and the fourth is a frequency controlling …

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Figures 1 and 2 show an active feedback loop with the incandescent bulb amplitude stabilization introduced by L.A. Meacham in 1938 and used in the HP 201A: Figure 1. Basic schematic of an oscillator built around the classic Wien network . For the Bridged-T network, α is some design factor greater than one, and typically two to four: Figure 2.