Method of speeding power-up of an amplifier, and amplifier
First Claim
1. An amplifier powered by a selectively engageable voltage source, the amplifier comprising:
- first and second electrodes for receiving an input signal to be amplified, the input first and second electrodes being adapted to be respectively connected to coupling capacitors;
a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output;
selectively engageable resistances between the voltage source and respective inputs of the differential amplifier and defining, with the coupling capacitors, the high pass characteristics of the circuit; and
second selectively engageable resistances between the voltage source and respective inputs of the differential amplifier, the second resistances respectively having smaller values than the first mentioned resistances, the second resistances being engaged then disengaged in response to the voltage source being engaged.
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Abstract
An amplifier powered by a selectively engageable voltage source and a method for operating the amplifier. The amplifier includes first and second electrodes for receiving an input signal to be amplified. The first and second electrodes are adapted to be respectively connected to coupling capacitors. The amplifier also includes a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output. The amplifier additionally includes selectively engageable resistances coupled between the voltage source and respective inputs of the differential amplifier and defining, with the coupling capacitors, the high pass characteristics of the circuit. The amplifier further includes second selectively engageable resistances coupled between the voltage source and respective inputs of the differential amplifier. The second resistances respectively have smaller values than the first mentioned resistances, and are engaged and then disengaged in response to the voltage source being engaged.
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Citations
9 Claims
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1. An amplifier powered by a selectively engageable voltage source, the amplifier comprising:
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first and second electrodes for receiving an input signal to be amplified, the input first and second electrodes being adapted to be respectively connected to coupling capacitors;
a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output;
selectively engageable resistances between the voltage source and respective inputs of the differential amplifier and defining, with the coupling capacitors, the high pass characteristics of the circuit; and
second selectively engageable resistances between the voltage source and respective inputs of the differential amplifier, the second resistances respectively having smaller values than the first mentioned resistances, the second resistances being engaged then disengaged in response to the voltage source being engaged. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of speeding power up of an amplifier stage powered by a voltage source and including first and second electrodes for receiving an input signal to be amplified, the input electrodes being adapted to be respectively connected to coupling capacitors;
- a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output; and
selectively engageable resistances between the voltage source and respective inputs of the differential amplifier, the method comprising;shorting around the selectively engageable resistances for a predetermined amount of time in response to the voltage source being engaged. - View Dependent Claims (9)
- a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output; and
Specification