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A Multi-bit VCO-based Linear Quantizer with Frequencyto-current Feedback using a Switched-capacitor Structure
- Authors
- Park, Sangyong; Ryu, Hyuk; Sung, Eun-Taek; Baek, Dong Hyun
- Issue Date
- Jun-2015
- Keywords
- VCO; Quantizer; Low harmonic distortion; Frequency-to-current feedback
- Citation
- IEIE Transactions on Smart Processing and Computing, v.4, no.3, pp 145 - 148
- Pages
- 4
- Journal Title
- IEIE Transactions on Smart Processing and Computing
- Volume
- 4
- Number
- 3
- Start Page
- 145
- End Page
- 148
- Abstract
- In this letter, we present a new linearization method for a voltage controlled oscillator(VCO)-based quantizer in an analog-to-digital converter (ADC). The nonlinearity of the VCO generates unwanted harmonic spurs and reduces the signal-to-noise and distortion ratio (SNDR) of the VCO-based quantizer. This letter suggests a frequency-to-current feedback method to effectively suppress harmonic distortion. The proposed method decreases the harmonic spurs by more than 53 dB. And a VCO-based quantizer employing the proposed linearization method achieves a high SNDR of 74.1 dB.
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