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- W3134851968 abstract "The four main passive circuit elements include the resistor, capacitor, inductor, and transformer. Inductors and transformers have been notoriously challenging to integrate in silicon, and they occupy a significant chip area. The limited metallization and conductive substrate result in a poor quality factor (Q) and limited self-resonance frequency. The tuning of inductor-based resonators is further challenged by the limited tuning range and Q of switched-capacitors/inductors. Recent LPTV N-path structures have demonstrated new functionalities that address some of these challenges, such as equivalent second-order LC bandpass filtering, lowpass filtering, notch filtering, and non-magnetic nonreciprocity [1-5]. Transformers face additional challenges of limited coupling coefficients, especially when a large turns ratio is desired [6], but they are critical to impedance transformation and matching networks. This paper describes an impedance-transforming N-path filter offering passive voltage gain, which realizes transformer-based coupled-resonator functionality that (i) features the traditional N-path benefits of high Q, high linearity, and LO-defined tuning, (ii) enables ideal coupling (k=1) regardless of the step-up ratio, (iii) can be cascaded with no transfer-function nonideality to achieve even higher step-up voltage gain with high out-of-band (OOB) rejection, (iv) emulates transformer behavior over a wide range of frequencies despite being single-ended (SE), and (v) has ultra-low clock-power consumption. The concepts are validated through two -0.1-to-1GHz 65nm CMOS prototypes that achieve step-up ratios (n) of 4 and 8 with k of 1, voltage gains of 15dB and 17dB at 500MHz with 27dB and 33dB OOB rejection, and buffer-de-embedded NFs of 3.4dB and 4.1dB at 500MHz, respectively. OP <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1dB</sub> is 2dBm, and the power consumption is 1.7 to 3.6mW over 0.1 to 1GHz for both prototypes." @default.
- W3134851968 created "2021-03-15" @default.
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- W3134851968 date "2021-02-13" @default.
- W3134851968 modified "2023-10-13" @default.
- W3134851968 title "26.7 An Impedance-Transforming N-Path Filter Offering Passive Voltage Gain" @default.
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- W3134851968 doi "https://doi.org/10.1109/isscc42613.2021.9365778" @default.
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