A Si BJT RF dual band receiver IC for DAB

This paper presents a fully integrated CMOS low-IF receiver working at L-band for DAB application. An imagerejection low noise amplifier (LNA) supplies over 30dB image rejection in the whole band. A calibration circuit improves matching of quadrature LO signals. Together with the quadrature weaver architecture, the receiver rejects the image signal more than 65dB. The receiver's noise figure is 4dB and OIP3 is 22dBm. The receiver is implemented in 0.25um CMOS process. The core die area is 9mm 2 . I IntroductionDAB (Digital Audio Broadcasting) is the third generation broadcasting system that has more superior performance than AM or FM. It takes use of OFDM modulation and has a bandwidth of 1.5MHz. The satellite DAB works at L-band. Some papers [1]-[2] has designed discrete receiver for satellite communication. But an integrated receiver will greatly reduce the size and improve the performance. However, because the on-chip inductor has poor performance and large area, the high frequency, high image rejection filter in superheterodyne receivers cannot be integrated in IC process. The In-phase and quadrature (I/Q) structure is used so that the wanted signal and its image signal can be separated in digital domain. But mismatch between I/Q branches restricts the image rejection to only about 35dB [3]. Another way is to use weaver receiver, which is image rejection architecture. But it is also sensitive to matching of mixers.A monolithic CMOS receiver with high image rejection is designed to improve image rejection. The receiver takes use of quadrature weaver architecture [4], which supplies good image rejection performance. Moreover, the LNA contains a notch filter. It further rejects image signals. An improved LO driver reduces the mismatching between LO quadrature signals generated from a poly phase filter (PPF). All of these effects bring the image rejection to -65-dB. II Circuit ImplementationThe receiver (showed in Fig.1) adopts low-IF quadrature weaver architecture. It avoids wandering DC offset and 1/f noise at low frequency. The six mixers in dashed frame compose double conversion structure. It is less sensitive to unbalance in the phase and amplitude of the RF and LO input signals of the mixers [5]. This means a better image rejection than traditional weaver architecture. o ff ch ip B P F active L P F active L P F A /D A /D V G A V G A L N A R F m ixer IF m ixer P G A V G A V G A I Q I Q calib ration circu it P olyp h ase filter O n e C h ip 8 d ivid er L O sign al gen erato r L O D river h igh freq uen cy a m p lifier IF m ixer IF m ixer IF m ixer P G A R F m ixer Fig.1 The block diagram of the receiver 1232

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“…Assuming and , the error item is rewritten as the formula (2). Define open loop gain of the op-amp as , where Gm is equivalent transconductance.…”

Section: Vip Vinmentioning

confidence: 99%

“…The satellite DAB works at L-band. Some papers [1]- [2] has designed discrete receiver for satellite communication. But an integrated receiver will greatly reduce the size and improve the performance.…”

mentioning

confidence: 99%

A monolithic CMOS L band DAB receiver

Wang

Chi

Lin

et al. 2005

Proceedings of the 2005 Conference on Asia South Pacific Design Automation - ASP-DAC '05

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“…The receiver design is governed by the signal characteristics of the Eureka 147 DAB system [3] and its environment Relevant characteristics of this system are therefore discussed first, followed by details of the receiver and AGC circuit designs and performance evaluations. The signal path circuit design and performance of both the RF and IF chips are discussed in [4]and [5], respectively.…”

Section: If2 Filtermentioning

confidence: 99%

Architecture and Performance of an Alternative DAB Receiver Chip Set

Clawin

Bolle

Buerger

et al. 1998

1998 28th European Microwave Conference

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A novel, dual conversion architecture for the Digital Audio Broadcasting (DAB) dual band receiver is introduced. It avoids preselection filters and mini. mizes the number of PLLs by first converting both Lband and Band m inputs to a common 919 MHz intermediate frequency (IF) signal which is then downconverted to the 30 MHz ADC input A carefuily staged gain control strategy is used to meet the challenging sensitivity and intermodulation requirements.Introduction.

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“…Various microwave LNAs have been studied to detect multi-band signals effectively. One simple method is to use optimized individual LNAs for each band reception, 2,3 but this approach has the disadvantages of complexity, high power consumption, a large circuit size, and high cost. To overcome this demerit, there are two approaches: switchable LNAs 4,5,6,7 and concurrent multi-band LNAs.…”

Section: Introductionmentioning

confidence: 99%

A concurrent X and K dual‐band low noise amplifier for a radar detection system

Park

Lee

2021

Micro & Optical Tech Letters

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This article presents a concurrent X-and K-bands low noise amplifier (LNA) for a radar detection system. A dual-band matching and direct current bias circuitry were configured using surface-mount device lumped capacitors and distributed transmission lines for the compact size. The designed LNA has dual-pass band operation and a notch between the X-and K-bands. The proposed LNA was implemented in hybrid integrated circuit technique on the microwave substrate. The measurement has showed the gains of 18.6 and 22.4 dB and noise figures of 3.29 and 1.67 dB at 10.525 and 24.1 GHz, respectively.

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A Si BJT RF dual band receiver IC for DAB

Cited by 11 publications

References 4 publications

A monolithic CMOS L band DAB receiver

A monolithic CMOS L band DAB receiver

Architecture and Performance of an Alternative DAB Receiver Chip Set

A concurrent X and K dual‐band low noise amplifier for a radar detection system

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