2 GHz Automatically Tuned Q-Enhanced CMOS Bandpass Filter

Nakaska, J.K.; Haslett, J.W.

doi:10.1109/mwsym.2007.379991

Cited by 9 publications

(3 citation statements)

References 3 publications

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“…Due to the low quality factor (Q) passive components (mainly the inductors) in CMOS process, the on-chip IRF only achieves limited image rejection ratio. The Q-enhancing technique [13]- [15] is utilized in this work, which utilizes the crosscoupled pairs to provide negative resistance and compensate the loss of the passive components. As shown in Fig.…”

Section: B Irfmentioning

confidence: 99%

A Fully Integrated K-Band Dual Down-Conversion Receiver for Radar Applications in 90 nm CMOS

Ding

Song

et al. 2020

IEEE Access

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A fully integrated K-band dual down-conversion receiver for phased array radar applications in 90 nm CMOS is presented. The receiver utilizes the dual down-conversion architecture to achieve superior performance. The integrated 1.15 GHz image-rejection filter (IRF) provides enough wideband (22 MHz) image rejection ratio at 140 MHz offset before the second down-conversion by utilizing the Q-enhancing and frequency staggering techniques to compensate the component loss. The low noise amplifier realizes the single-to-differential-ended conversion at the input with a transformer and achieves good common-mode rejection. The 70 MHz intermediate frequency baseband consists of two cascaded 3rd-order band-pass active-RC filters (BPFs) and one automatic gain control (AGC) loop, with the integrator frequency compensation technique to lower down the requirements on the embedded Op-Amps. Two phase-locked loop (PLL) frequency synthesizers are integrated to provide the local oscillation (LO) signals for the down-conversions, where the matching of the charge-pump is improved by adding one extra current compensation branch. The measurements of the prototype show that the receiver converts the targeted mm-wave signal to 70 MHz intermediate frequency while achieving 8.3 dB noise figure (NF), 51-95 dB variable gain range and >45 dB image rejection ratio at 140 MHz offset with >22 MHz signal bandwidth. The receiver draws 74 mA current (excluding 2 PLLs) from the 1.2 V power supplies and occupies a core area of 4.58 × 0.53mm 2 (excluding 2 PLLs).INDEX TERMS Dual-conversion receiver, image rejection filter, wireless receiver, band-pass filter, automatic gain control loop (AGC), CMOS.

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Section: B Irfmentioning

confidence: 99%

A Fully Integrated K-Band Dual Down-Conversion Receiver for Radar Applications in 90 nm CMOS

Ding

Song

et al. 2020

IEEE Access

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“…10) is loaded by the very same filter network, but with slightly different impedance values . The input impedance of this LC network is therefore (9) with zero and pole frequencies of (10)…”

Section: Double Notch Filtermentioning

confidence: 99%

An Image Frequency Rejection Filter for SAW-Less GPS Receivers

Barth

Linscott

Inan

2012

IEEE Trans. Circuits Syst. I

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We have developed an on-chip RF filter in 130 nm BiCMOS for SAW-less GPS receivers. The filter is implemented as a cascode amplifier stage with reactive resonant tanks. The filter employs two Q-enhanced LC tanks to create a transfer function with steep roll-off characteristic and narrow passband. The image rejection filter achieves a 3 dB bandwidth of less than 12 MHz at the GPS center frequency of 1575.42 MHz. The resulting magnitude response exhibits a notch at 1540 MHz and at 1610 MHz, attenuating noise and interference 30 MHz away from the center frequency by more than 30 dB. The NF of the RF filter is 4.0 dB. A competitive power consumption of only 5.7 mW is achieved.Index Terms-GPS receiver, notch filter, Q-enhanced resonator, surface acoustic wave (SAW) filter.

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“…In fact, the addition of the negative resistance: 1) modifies the P 1dB of the circuit to P 1dB Q 0 /Q and 2) modifies the P n of the circuit to P n Q/Q 0 . Although there has been more than a decade research on these types of BPFs, most of the designs do not achieve enough DR which is to a first degree is due to the limited Q-factor of on-chip inductors [9,10,11,12,13,14,15,16,20,21,23,24,26,27,28,29,30,31,32,33]. …”

Section: Performancementioning

confidence: 99%

Active N-path Filters: Theory and Design

Darvishi¹

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2 GHz Automatically Tuned Q-Enhanced CMOS Bandpass Filter

Cited by 9 publications

References 3 publications

A Fully Integrated K-Band Dual Down-Conversion Receiver for Radar Applications in 90 nm CMOS

A Fully Integrated K-Band Dual Down-Conversion Receiver for Radar Applications in 90 nm CMOS

An Image Frequency Rejection Filter for SAW-Less GPS Receivers

Active N-path Filters: Theory and Design

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