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US 7,612,615 B1Granted
Dual supply amplifier
AssigneeMediatek Inc.
InventorChun-chih Hou
Life of this patent
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Abstract
A dual supply amplifier without using an inter-stage capacitor is disclosed. The dual supply amplifier has an input stage coupled to a lower supply voltage VDD1 for generating a voltage signal V3 proportion to a difference between a pair of inputs. A conversion stage is coupled a higher supply voltage VDD2 and a third supply voltage VDD3, which can be ground or a negative potential, for generating a signal V1 with reference to VDD2 and a signal V2 with reference to VDD3. An output stage receives V1 and V2 for generating an output signal Vo with a swing between VDD2 and VDD3.
Claims12
A dual supply amplifier comprising:
- an input stage coupled to a first supply voltage, the input stage receiving a pair of input signals for generating a first voltage signal with a magnitude proportional to a difference of the pair of input signals;
- a conversion stage coupled to the first supply voltage, a second supply voltage and a third supply voltage, the third supply voltage being lower than the first and second supply voltages, the conversion stage receiving the first voltage signal from the input stage for generating a second voltage signal with reference to the second supply voltage and a third voltage signal with reference to the third supply voltage;
- and
- an output stage coupled to the second supply voltage and the third supply voltage, the output stage receiving the second voltage signal and the third voltage signal for generating an output signal with a swing between the second supply voltage and the third supply voltage.
1 more element
Dependencies are inferred from the claim text.