Overdrive control system
First Claim
1. An overdrive control system to be coupled between first and second reference voltages and to an amplification stage having a first input, a second input, and an output, the overdrive control system comprising:
- an input terminal and an output terminal to be coupled respectively to the first and second inputs of the amplification stage;
an internal node coupled to said output terminal;
a voltage controlled current source having a control terminal and to be coupled between the first reference voltage and said internal, node;
an adding block having first and second inputs and an output, said first input of said adding block coupled to said input terminal, said output of said adding block being coupled to said control terminal of said voltage controlled current source; and
at least one clamping block to be coupled between said output terminal and the second reference voltage, and coupled to said second input of said adding block;
said voltage controlled current source to deliver a compensation current to said output terminal when a voltage signal on said input terminal has a value greater than a voltage signal on said output terminal to thereby force the voltage signal on the output terminal to follow the voltage signal on the input terminal by an amount based upon a clamping voltage provided by said at least one clamping block.
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Accused Products
Abstract
An overdrive control system includes a voltage controlled current source to deliver a compensation current, and being between a first voltage reference and an internal node, which is connected to an output terminal. The voltage controlled current source has a control terminal connected to an output terminal of an adding block, which has a positive input connected to an input terminal. At least one clamping block is between the output terminal and a second voltage reference, and is connected to a negative input of the adding block. The voltage controlled current source delivers its compensation current to the output terminal when a voltage signal on the input terminal has an higher value than a voltage signal on the output terminal, and forces an output voltage signal to follow an input voltage signal to an extent that depends on a clamping voltage provided by the clamping block.
11 Citations
24 Claims
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1. An overdrive control system to be coupled between first and second reference voltages and to an amplification stage having a first input, a second input, and an output, the overdrive control system comprising:
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an input terminal and an output terminal to be coupled respectively to the first and second inputs of the amplification stage; an internal node coupled to said output terminal; a voltage controlled current source having a control terminal and to be coupled between the first reference voltage and said internal, node; an adding block having first and second inputs and an output, said first input of said adding block coupled to said input terminal, said output of said adding block being coupled to said control terminal of said voltage controlled current source; and at least one clamping block to be coupled between said output terminal and the second reference voltage, and coupled to said second input of said adding block; said voltage controlled current source to deliver a compensation current to said output terminal when a voltage signal on said input terminal has a value greater than a voltage signal on said output terminal to thereby force the voltage signal on the output terminal to follow the voltage signal on the input terminal by an amount based upon a clamping voltage provided by said at least one clamping block. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A voltage amplifier to be coupled to first and second reference voltages and having an input terminal and an output terminal, the voltage amplifier comprising:
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first and a second amplification stages to be coupled between the first and second reference voltages and coupled, in cascade to each other, between the input and output terminals of the voltage amplifier; a biasing resistor and a feedback capacitor coupled in series with each other to couple said second input of said second amplification stage to the second reference voltage; said second amplification stage having a first input, a second input, and an output; said first amplification stage having an output coupled to said first input of said second amplification stage; a feedback resistor coupled between said second input terminal and said output of said second amplification stage; the output of said second amplification stage coupled to the output terminal of the voltage amplifier; and an overdrive control system coupled to said first and second input terminals of said second amplification stage and comprising an input terminal and an output terminal coupled respectively to said first and second inputs of said second amplification stage, an internal node coupled to said output terminal of said overdrive control system, a voltage controlled current source having a control terminal and to be coupled between the first reference voltage and said internal node, an adding block having first and second inputs and an output, said first input of said adding block being coupled to said input terminal of said overdrive control system, said output of said adding block being coupled to said control terminal of said voltage controlled current source, and at least one clamping block to be coupled between said output terminal of said overdrive control system and the second reference voltage, and to said second input of said adding block, said voltage controlled current source to deliver a compensation current to said output terminal of said overdrive control system when a voltage signal on said input terminal has a value greater than a voltage signal on said output terminal of said overdrive control system to thereby force the voltage signal on said output of said overdrive control system to follow the voltage signal on said input of said overdrive control system by an amount based upon a clamping voltage provided by said at least one clamping block. - View Dependent Claims (15, 16, 17)
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18. A method of making an overdrive control system to be coupled to first and second reference voltages and to an amplification stage having a first input, a second input, and an output, the method comprising:
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providing an input terminal and an output terminal to be respectively coupled to the first and second inputs of the amplification stage; coupling an internal node to the output terminal; providing a voltage controlled current source to be coupled between the first reference voltage and the internal node; coupling a first input of an adding block to the input terminal; coupling a control terminal of the voltage controlled current source to an output of the adding block; and providing at least one clamping block to be coupled between the output terminal and the second reference voltage, and to be coupled to the second input of the adding block; the voltage controlled current source to deliver a compensation current to the output terminal when a voltage signal on the input terminal has a value greater than a voltage signal on the output terminal to thereby force the output voltage signal to follow the input voltage signal by an amount based upon a clamping voltage provided by the at least one clamping block. - View Dependent Claims (19, 20, 21, 22, 23, 24)
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Specification