A High Dynamic Range Programmable CMOS Front-End Filter with a Tuning Range from 1850 to 2400 MHz

Christensen, K.T.; Lee, Thomas H.; Bruun, Erik

doi:10.1023/b:alog.0000042328.60366.69

Cited by 9 publications

(5 citation statements)

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“…The closed loop transfer function of the interference cancellation loop can be expressed by (1) with being the LNA transconductance, the LC tank impedance, (2) and…”

Section: B Transfer Functionmentioning

confidence: 99%

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An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

Werth

Schmits

Wunderlich

et al. 2010

IEEE J. Solid-State Circuits

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A feedback interference cancellation circuit is presented that uses a control loop to reject blockers in wireless receivers. The concept is based on a feedback translational loop which subtracts a blocker replica from the original blocker signal. In contrast to feedforward methods loop selectivity does not depend on exact gain matching of two paths but on the open loop gain which is easier to adjust. The concept is described including the theoretical derivations of the transfer function and stability. Nonidealities like I/Q mismatch and noise mechanisms are discussed. Finally, measurements from a prototype chip in 65-nm CMOS are presented showing the feasibility of active feedback cancellation. In a desensitization scenario, gain drops by more than 12 dB for a 15 dBm blocker at 20 MHz offset without feedback interference cancellation while a gain degradation of merely 3 dB is measured with feedback interference cancellation enabled.

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“…The closed loop transfer function of the interference cancellation loop can be expressed by (1) with being the LNA transconductance, the LC tank impedance, (2) and…”

Section: B Transfer Functionmentioning

confidence: 99%

“…Therefore, on-chip blocker filtering techniques are currently being devised. Several approaches have been presented reaching from quality factor (Q) enhanced LNA bandpass filters [1], [2] to active cancellation techniques. Feedforward cancellation has been demonstrated for generating a bandpass filter [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

Werth

Schmits

Wunderlich

et al. 2010

IEEE J. Solid-State Circuits

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“…The frequency range is tunable up to 25% and the quality factor can be varied up to 50. In the authors' knowledge this was only reached by [6] so far. The input referred compression point for out-of-band blockers is about 0 dBm for 300 MHz below the design center frequency and even higher for 250 MHz above the design center frequency.…”

Section: Discussionmentioning

confidence: 92%

“…There are two different structures to enhance the quality factor which are state of the art. Cross-coupled transistor pair based structures are presented in [4], [5] and [6] and a transformer based structure is presented in [7]. This paper describes a new Q-enhancement (QE) structure stacked on a low noise amplifier (LNA) in the current domain.…”

Section: Introductionmentioning

confidence: 99%

A new Q-enhancement architecture for SAW-less communication receiver in 65-nm CMOS

Schmits

Werth

Hausner

2009

2009 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT)

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A 2.5V second order RF bandpass filter is presented. A new Q-enhancement structure stacked on a LNA is fabricated in a 65-nm CMOS process with a die area of 1.1 mm x 1.1 mm. The frequency range is adjustable in a 25% range from 1.7 GHz to 2.2 GHz while the Q is adjustable up to 50. Q and the center frequency are adjusted by binary weighted switchable capacitors. The filter draws 42 mA including the buffers from a 2.5 V supply and has an input referred out-of-band 1-dB compression point of 0 dBm. The measured in-band NF is between 5.4 and 6.2 dB.

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“…A figure of merit [18] (FOM) which allows comparison between other RF filters in silicon is given as where N is the number of poles, P 1dBW is the inband 1-dB compression point in Watt, f center is the center frequency, Q filter is the ratio of the center frequency and the 3-dB bandwidth, P DC is the DC power dissipation in Watt, and NF is the noise figure (not in dB). It has shown from Table II that the filter presented in this work achieves a good FOM with higher quality factor and gain in the passband, and the tuning range is the largest, and the chip area is the smallest.…”

Section: Refmentioning

confidence: 99%

Design of CMOS Integrated Q-enhanced RF Filters for Multi-Band/Mode Wireless Applications

Gao¹

2011

Advanced Trends in Wireless Communications

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A High Dynamic Range Programmable CMOS Front-End Filter with a Tuning Range from 1850 to 2400 MHz

Cited by 9 publications

References 0 publications

An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

An Active Feedback Interference Cancellation Technique for Blocker Filtering in RF Receiver Front-Ends

A new Q-enhancement architecture for SAW-less communication receiver in 65-nm CMOS

Design of CMOS Integrated Q-enhanced RF Filters for Multi-Band/Mode Wireless Applications

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