| CPC H03M 1/06 (2013.01) [G05F 1/46 (2013.01); G06F 3/041 (2013.01); H03M 1/08 (2013.01)] | 20 Claims |

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1. A circuit comprising:
an amplifier having first and second inputs and an output;
a first transistor having a control terminal coupled to the output of the amplifier, a first terminal, and a second terminal;
a second transistor having a first terminal, a second terminal coupled to the first terminal of the first transistor, and a control terminal;
a third transistor having a first terminal, a second terminal coupled to the second input of the amplifier, and a control terminal coupled to the second terminal of the second transistor;
a fourth transistor having a control terminal coupled to the output of the amplifier, a first terminal, and a second terminal;
a fifth transistor having a control terminal, a first terminal coupled to the second terminal of the fourth transistor, and a second terminal coupled to a reference terminal; and
a sixth transistor having a control terminal coupled to the first terminal of the fifth transistor, a first terminal coupled to the second terminal of the third transistor, and a second terminal coupled to the reference terminal.
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