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Gain control or multiplier circuits
| Details |
Inventors: Roberts, John H.;
Assignee: Peavey Electronics Corporation (Meridian, MS)
Primary Examiner: Mottola; Steven
Assistant Examiner:
Attorney, Agent or Firm: Huff & Associates
This invention concerns, in a current-controlled amplifier circuit, the combination of output amplifier means having an input conductor and having an output conductor for converting a signal at the input conductor of the output amplifier means to a current amplified signal, feedback means connected between the output and input conductors of the output amplifier means and including a differential pair of semiconductors having a control current output, for presenting a signal at the input conductor of the output amplifier means which is the product of an input signal to the amplifier circuit and the ratio of a reference current to the control current and for substantially eliminating dc input at the input conductor of the output amplifier means and setting the quiescent currents of the semiconductors of the differential pair substantially equal. |
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DETAILED DESCRIPTION OF THE INVENTION Referring at this time to FIG.
1, a diagrammatic multiplier circuit system is illustrated therein.
As shown, the circuit includes an input terminal 10 to which an input signal of ac waveform is applied, substantially in accord with the waveform illustrated immediately above this terminal.
This signal is applied to the input conductor 12 of the input amplifier means 14, whose output conductor 16 is connected to the differential semiconductor pair indicated at 18 and which is associated with the output amplifier means 20, as shown.
The input amplifier means is provided with feedback means which is in the form of parallel branches connected between the output conductor 16 of the input amplifier means and the input conductor 12 of the input amplifier means 14.
One branch comprises the current path 22 of one semiconductor of the differential semiconductor pair 18 (current paths as indicated by the arrows) and which one semiconductor is provided with the base controlling input port 24, the pair 18 having the reference current output port 26 as indicated.
The other branch comprises the current path 28 of the other semiconductor of the pair 18, which has the base control input port 30 connected to the output conductor 16, in series with the current mirror circuit 32.
The amplifier means 14 with the differential pair 18 and the current mirror circuit 32 oppose the signal applied at the terminal 10 and create a signal waveform at the junction 34 which is the product of the input signal at 10 and the reference current at 26.
The output stage amplifier means 20 has two feedback means associated therewith, the high pass feedback means 36 whose function is later described, and the low pass feedback means comprised of the parallel branches of which one is the current path 38 of one semiconductor of the differential pair 40 and which has the base controlling input port 42 connected to the junction 34, and the other branch of which is through the low pass filter means 44 from the output conductor 60 applied to the base controlling input port 46 of the other semiconductor of the pair 40 and the current path 48 of such other semiconductor in series with the current mirror circuit 50
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Cell Phones 
