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PS Audio Gain Cell... Kako to radi?

18 posts in this topic

deo teksta patenta

This invention relates to a voltage controlled attenua- by loading effects on the gain cell, tor and more specifically to

a voltage controlled attenu- 5 In this invention there is described a voltage collator having wide dynamic range and low

distortion. trolled attenuator comprising a pair of gain cells having

The basic gain cell principle concerns the use and low current densities and in which each cell is directly

modification of differential amplifiers and has been the fed by a linearized current source adapted to receive

subject of articles and experimentation. appropriate input signals. In the preferred embodiment,

For example, the Quatre Company of Canoga Park, 10 the low current densitis are achieved by using large area

California 91304, has recently published an article enti- transistors for maintaining the low current densities,

tied "Quatre Gain Cells Solid State Electronic Prod- however, it is also contemplated that parallel multiple

ucts." The Quatre article describes and illustrates the transistors may also be used to provide the increased

gain cell approach the bipolar transistor audio products. areas needed to minimize the current density problem.

The term "gain cell" is believed first used by B. Gilbert IS The gain cells are controlled by a single control volt

in the referred-to article and has been described as a age that feeds both control cells simultaneously,

log/antilog transconductance multiplier. A linearized buffer amplifier is connected to the out

The present invention is concerned primarily with put of each gain cell for minimizing loading on the gain

utilizing the basic concepts of the gain cell as an essen- cell thereby minimizing distortion,

rial element in a voltage controlled attenuator having an 20 A differential output amplifier is fed by the buffer

extremely wide dynamic range and lower distortion amplifiers for generating an output signal in which the

components that have heretofore been achieved by the effect of the control voltage in the output signal is elimi

prior art. nated and any DC shift caused by changes in control

A voltage controlled attenuator is bascially a gain voltage and residual distortion is removed by the operacontrol

device used to control the gain of an external 25 tion of the differential output amplifier, circuit which may be a

receiver, a switching device, or The circuit is implemented by utilizing a pair of tranany other remotely controlled

electronic circuitry. sistors in each gain cell in which each pair of transistors

It is usually most desirable to use a low level control have emitters connected together and each pair of emit

voltage and preferably a DC voltage to control the gain ters is fed directly by a separate linearized current

of some external electronic device and usually this con- 30 source adapted to receive reciprocal input signals,

trol takes place at a remote location. By utilizing a DC One transistor of each pair in the gain cell has the

control voltage the operator can be located at a remote base and collector connected together and to signal

location without fear of affecting the circuit being con- ground. The bases of the other transistor of each pair

trolled. are then connected together and fed by a single control

In the typical case input signals to be controlled are 35 voltage,

differentially fed to a pair of gain cells also controlled The gain cell circuit may therefore be likened to a

by a DC voltage control for varying the gain of the pair of differential amplifiers with the control voltage

input signal. The output signals from the gain ceils are driving one base of each pair of transistors comprising

fed to a differential amplifier which has the well known the gain cells.

effect of cancelling out the DC effect caused by the 40 A separage resistor is connected from each of the

control voltage used on the gain cells and allowing only collectors of the other transistors comprising the gain

the attenuated AC signal to appear in the output of the cells to a voltage source thereby developing the output

differential amplifier. Unfortunately these devices voltage from the gain cells across these load resistors,

lacked speed and dynamic range and suffered from A buffered differential amplifier is connected across

distortion. 45 the load resistors for generating the output signal.

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Из које године је тај појачавач, мени личи да је матор.

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1979 :oke:

"In 2004, PS Audio invented the Gain Cell™." :D

Eto, toliko od mene...

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Da, ali da ne upadnemo u zamku da te dve stvari zato što imaju iste nadimke posmatramo kao iste, ako, možda i nisu...

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