| 主权项 |
1. A circuit comprising:
a comparator having a differential input pair comprising a first differential transistor and a second differential transistor; and an input current boost circuit to boost a current of the differential input pair during transition of at least one input to the differential input pair, the input current boost circuit comprising: a first transistor configured to apply a first voltage to the first differential transistor of the differential input pair, the first transistor having a gate coupled to a first input of the at least one input to the differential input pair; a first capacitor coupled to the first transistor to turn off said first transistor in response to charge stored therein from current through said first transistor; a second transistor configured to apply a second voltage to the second differential transistor of the differential input pair, the second transistor having a gate coupled to a second input of the at least one input to the differential input pair; a second capacitor coupled to the second transistor to turn off said second transistor in response to charge stored therein from current through said second transistor; a third transistor coupled in parallel to the first capacitor and having a control terminal coupled to the second input of the differential input pair; and a fourth transistor coupled in parallel to the second capacitor and having a control terminal coupled to the first input of the differential input pair, wherein, in response to a first transition of the first and second inputs to the differential input pair, the first differential transistor turns on, the second differential transistor and the second transistor are off, and the first transistor initially turns on and then turns off as a voltage on the first capacitor increases, and wherein, in response to a second transition of the first and second inputs to the differential pair, the second differential transistor turns on, the first differential transistor and the first transistor are off, and the second transistor initially turns on and then turns off as a voltage on the second capacitor increases, the circuit further comprising a load circuit having inputs coupled to outputs of the differential input pair, the load circuit comprising a plurality of current mirrors, a summing circuit, and an inverter, wherein at least one current mirror comprises a first current mirror transistor coupled between a first reference voltage and a second reference voltage and a second current mirror transistor coupled between the first reference voltage and a third reference voltage. |
