Pulse modulated charge pump circuit
OwnerSiyou Weng, Tacettin Isikinventors
Life of this patent
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Abstract
A circuit for increasing a gate voltage of a transmission gate in a high-speed switch to a level higher than a level of a supply voltage is provided. The circuit includes an oscillator generating a clock signal and a charge pump circuit operatively coupled to the oscillator. The charge pump circuit receives the supply voltage and the clock signal as inputs, and outputs the gate voltage. The circuit also includes a comparator circuit coupled to the oscillator circuit and the charge pump circuit and a pulse signal generator circuit operatively coupled to the oscillator, the pulse signal generator circuit generating a pulse signal which enables the oscillator.
Claims19
A circuit, comprising:
- an oscillator generating a clock signal;
- a charge pump circuit operatively coupled to the oscillator and receiving a supply voltage and the clock signal as inputs;
- a pulse signal generator circuit generating a pulse signal;
- and
- a comparator circuit coupled between the oscillator and the pulse signal generator circuit, the comparator circuit receiving the pulse signal as an input, and outputting an enable signal to the oscillator.
(canceled)
A circuit for increasing a gate voltage of a transmission gate in a high-speed switch to a level higher than a level of a supply voltage, comprising:
- an oscillator generating a clock signal;
- a charge pump circuit operatively coupled to the oscillator, the charge pump circuit receiving the supply voltage and the clock signal as inputs, and outputting the gate voltage;
- a comparator circuit coupled to the oscillator circuit and the charge pump circuit;
- and
- a pulse signal generator circuit operatively coupled to the comparator, the pulse signal generator circuit generating a pulse signal to enable the oscillator and modulate the charge pump circuit through the comparator.
A method of increasing a voltage of a transmission gate in a high-speed switch, comprising:
- generating a pulse signal at a predetermined or adaptive frequency and pulse width;
- comparing the pulse signal with a predetermined reference voltage and outputting an enabling signal;
- generating a clock signal at predetermined intervals in response to the generated enabling signal;
- and
- increasing the voltage of the transmission gate in response to the generated clock voltage.
Dependencies are inferred from the claim text.