| CPC H03K 5/1252 (2013.01) [G05F 1/56 (2013.01); H03K 3/011 (2013.01); H03K 3/0315 (2013.01); H03K 3/0322 (2013.01); H03L 1/00 (2013.01)] | 20 Claims |
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1. An apparatus comprising:
a first circuit configured to generate a reference signal and a bias signal in response to a supply voltage and a first input signal, wherein said first circuit provides supply noise rejection to variations in said supply voltage;
a second circuit connected to said first circuit and a ring oscillator;
a first transistor connected to said first circuit and configured to set a first reference current of said first circuit based on said first input signal and a first programmable resistance;
a second transistor connected in parallel with said first transistor, wherein said second transistor is diode-connected; and
a third transistor connected to said first circuit and configured to set a second reference current of said first circuit based on said first input signal and a second programmable resistance, wherein
said first circuit forms a current mirror with said second circuit, and
said second circuit is configured to provide a programmable current ratio for said current mirror based on a value of a second input signal.
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