A Switched-Opamp Technique for Low-Voltage Switched-Capacitor Circuits
- Summary
- A new switched-opamp technique is proposed to operate switched-capacitor circuits at supply voltages as low as 1-V without on-chip voltage multiplier or low-Vt devices. The main idea of the new switched-opamp technique is to implement an additional switchable operational amplifier (opamp) in parallel but in an alternate clock phase compared to the original switched opamp. As such, for every clock phase, there exists an opamp that is fully functional in the switched-capacitor system. The two switchable opamps are further combined to realize a single two-switchable-output-pair opamp to save power and area and to minimize the mismatch. Unlike existing ones, the proposed switched-opamp technique can be directly applied to implement most of the existing classical switched-capacitor circuits and is highly compatible with their synthesizing techniques. By using the new technique, switched-capacitor circuits can be designed to operate at high frequencies with only a single 1-V supply in a standard CMOS process.
- Technology Benefits
- In the proposed switched-opamp technique, the opamps allow multi-phase operation, making it fully functional at any time, and consequently can be combined with other switched-capacitor techniques to achieve higher performance in terms of speed, supply voltage, and power consumption. As such, it can be applied to implement high-performance switched-capacitor filters and analog-to-digital converters for wireless and telecommunication applications.
- Technology Application
- - All existing switched-capacitor circuits, in particular filters and analog-to-digital converters
- Low-voltage high-frequency applications, including wireless and telecommunications
- Supplementary Information
- Patent Number: CN100458979C
Application Number: CN2001804246A
Inventor: H.C. Luong | Cheung S-L
Priority Date: 28 Jan 2000
Priority Number: CN100458979C
Application Date: 29 Jan 2001
Publication Date: 4 Feb 2009
IPC Current: G11C002702 | H03F000300 | H03F000330 | H03F000345 | H03F000372
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Switched OPAMP technology for low-voltage switched-capacitor circuits | Used for switch type operational amplifier technology of low voltage switch capacitor circuit
Usefulness: Switched OPAMP technology for low-voltage switched-capacitor circuits | Used for switch type operational amplifier technology of low voltage switch capacitor circuit
Summary: For low voltage switched-capacitor system. Also used for pseudo-n-path double sampling, capacitance spread reduction and sample correction techniques implemented in standard CMOS technology.
Novelty: Switched operational amplifier circuit for low voltage switched capacitor system, consists of two operational amplifiers which are connected in parallel and are operated in alternate clock phases
- Industry
- Electronics
- Sub Category
- Semiconductor
- Application Date
- 29 Jul 2002
- Application No.
- Chinese 01804246.5
- Patent Information
- Chinese ZL01804246.5
- ID No.
- TTC.PA.115
- Country/Region
- Hong Kong
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