Improved characterization of differential multi-Ghz integrated amplifiers and filters
17 May 2015-pp 1-4
TL;DR: In this paper, the authors demonstrate that the use of on-chip polarity reversal buffers greatly enhances accuracy by reducing the effect of finite package isolation and by mitigating errors due to common-mode to differential mode conversion.
Abstract: Accurate characterization of fully differential on-chip filters and amplifiers whose bandwidths extend to several GHz is challenging. Measurement using a packaged chip is convenient, but not accurate due to nonidealities of the package. In this work, we demonstrate that the use of on-chip polarity reversal buffers greatly enhances accuracy by reducing the effect of finite package isolation and by mitigating errors due to common-mode to differential mode conversion. Further, the technique also allows differential characterization using only two-port single-ended measurements, without compromising much on accuracy. Measurements on an integrated 7 GHz Bessel filter made using this technique show good consistency up to 20 GHz whether the chip is probed or bench characterized after mounting in a QFN package.
Citations
More filters
Proceedings Article•
01 Jan 2007
TL;DR: When compared to conventional frequency response measurement methods, the proposed techniques show a significantly enhanced measurement accuracy in the stopband, while being less sensitive to package characteristics.
Abstract: ·We present techniques for accurately characterizing the frequency response and noise spectral density of integrated continuous-time filters. A 75-MHz fifth-order Chebyshev Gm-C ladder filter designed in a 0.35-μm CMOS process and packaged in a 40-pin DIP is used as a test vehicle to validate the ideas proposed in this work. When compared to conventional frequency response measurement methods, the proposed techniques show a significantly enhanced measurement accuracy in the stopband, while being less sensitive to package characteristics.
12 citations
References
More filters
TL;DR: In this article, a fully integrated UWB beam-former with controllable true time delay and power gain is reported, achieving a 4-bit delay variation for a total of 64 ps of achievable group delay with 4-ps resolution, a 5-dB gain variation in 1-dB steps, and a worst case -3dB gain bandwidth of 13 GHz.
Abstract: Ultra-wideband (UWB) beam-forming, a special class of multiple-antenna systems, allows for high azimuth and depth resolutions in ranging and imaging applications. This paper reports a fully integrated UWB beam-former featuring controllable true time delay and power gain. Several system and circuit level parameters and characterization methods influencing the design and testing of UWB beam-formers are discussed. A UWB beam-former prototype for imaging applications has been fabricated with the potential to yield 20 mm of range resolution and a 7deg angular resolution from a four-element array with 10 mm element spacing. The UWB beam-former accomplishes a 4-bit delay variation for a total of 64 ps of achievable group delay with a 4-ps resolution, a 5-dB gain variation in 1-dB steps, and a worst case -3-dB gain bandwidth of 13 GHz. Overall operation is achieved by the integration of a 3-bit tapped delay trombone-type structure with a 4-ps variable delay resolution, a 1-bit, 32-ps fixed delay coplanar-type structure, and a variable-gain distributed amplifier. The prototype chip fabricated in a 0.18 mum BiCMOS SiGe process occupies 1.6 mm2 of silicon area and consumes 87.5 mW from a 2.5-V supply at the maximum gain setting of 10 dB
95 citations
04 Nov 2010
TL;DR: For the analog baseband section of a 60GHz receiver for fast download applications, two 5th order Butterworth filters with cutoff frequency of 880MHz and 1.76GHz for 60GHz radios are implemented in 40nm low power digital CMOS, using Sallen and Key biquads.
Abstract: For the analog baseband section of a 60GHz receiver for fast download applications, two 5th order Butterworth filters with cutoff frequency of 880MHz and 1.76GHz for 60GHz radios are implemented in 40nm low power digital CMOS, using Sallen and Key biquads. Drawing 25/21mA from a 1.1V supply, an IIP3 of −13/−12dBV to −16.7/−18.3dBV and an input-referred noise of 320/280µVrms are measured for the 880/1760MHz filter.
35 citations
03 Apr 2012
TL;DR: In this work the Gm-C topology is adopted for its merits at high frequencies and two critical parameters should be accounted for: the accuracy of the Q factors of the pole pairs and parasitic capacitances.
Abstract: As of today, the highest cut-off frequency low-pass continuous-time analog filters are in the frequency band of 1 to 3GHz [2,4–6], targeting applications like UWB communications or hard disk drives. Nevertheless, bands much higher, of about 10GHz, are to be addressed in the near future. This paper demonstrates an active low-pass filter tunable from 1 to 10GHz in 65nm CMOS, which is to our knowledge the highest ever cutoff frequency reported.
28 citations
TL;DR: A ladder filter-based programmable time-delay element for beamforming in ultra-wideband (UWB) systems and a lumped-element realization becomes possible by approximating e-std as a ratio of polynomials (based on Taylor and Padé expansions).
Abstract: We introduce a ladder filter-based programmable time-delay element for beamforming in ultra-wideband (UWB) systems. Such a lumped-element realization becomes possible by approximating e
-std
as a ratio of polynomials (based on Taylor and Pade expansions). When compared with conventional methods based on the tapped delay-line architecture, the proposed technique achieves lower power dissipation, higher delay range and resolution, and better area efficiency. A prototype delay line designed for the 3.1-10.6 GHz UWB range achieves a delay range of 140 ps and a gain range of -30 dB to +10 dB. Fabricated in a 0.25 μm SiGe BiCMOS process, the delay element occupies an active area of 1 mm
2
and consumes 53 mW from a 2.5 V supply. A four-antenna beamforming system using the delay element can achieve a scanning range of ±61
°
with 0.86 °
resolution for an antenna spacing of 15 mm.
23 citations
Proceedings Article•
01 Jan 2007
TL;DR: When compared to conventional frequency response measurement methods, the proposed techniques show a significantly enhanced measurement accuracy in the stopband, while being less sensitive to package characteristics.
Abstract: ·We present techniques for accurately characterizing the frequency response and noise spectral density of integrated continuous-time filters. A 75-MHz fifth-order Chebyshev Gm-C ladder filter designed in a 0.35-μm CMOS process and packaged in a 40-pin DIP is used as a test vehicle to validate the ideas proposed in this work. When compared to conventional frequency response measurement methods, the proposed techniques show a significantly enhanced measurement accuracy in the stopband, while being less sensitive to package characteristics.
12 citations