Amplifiers – Wheatstone bridge with amplifier in at least one arm
Patent
1986-12-22
1988-01-26
Mullins, James B.
Amplifiers
Wheatstone bridge with amplifier in at least one arm
330297, H03F 320
Patent
active
047219190
ABSTRACT:
Conventional bridged amplifiers obtain output voltage range and DC operating voltage from full and half voltage outputs of a voltage divider. A low voltage unipolar supply powers the voltage divider for small signals. A peak detector selects the higher peak amplifier output; and a voltage follower with an output voltage range from a high voltage unipolar supply maintains an output voltage a predetermined level above the peak. The output of the follower controls a transistor connecting the high voltage supply to the full voltage output of the voltage divider to allow the bridged amplifier outputs to increase above the low voltage supply as necessary in class G operation. An input amplifier obtains output voltage range and DC operating level from the full and half voltage outputs of the voltage divider and has differential outputs connected in opposite phase to the inputs of the bridged amplifiers so that the DC operating level shifts with the output voltage range to maintain an undistorted output across the load in spite of clipped individual outputs due to the lack of oppositely poled supplies. The predetermined voltage is large enough to ensure that the transistor can provide sufficient current from the high voltage supply at high output levels in class G operation.
REFERENCES:
patent: 4329657 (1982-05-01), Kamiya
patent: 4404527 (1983-09-01), Schertz et al.
patent: 4443771 (1984-04-01), Ishii et al.
patent: 4518928 (1985-05-01), Ishii
patent: 4560946 (1985-12-01), Yokoyama
Highest Efficiency and Super Quality Audio Amplifier Using MOS Power FETs in Class G Operation. (Sampei, Ohashi, Ohta, Inoue), IEE Transactions on Consumer Electronics, vol. CE-24, No. 3, Aug. 1978.
LaRosa David A.
Osburn David W.
General Motors Corporation
Mullins James B.
Sigler Robert M.
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