Low - Voltage Tunable Pseudo - Differential Transconductor with High Linearity
نویسندگان
چکیده
© 2009 ETRI Journal, Volume 31, Number 5, October 2009 A novel tunable transconductor is presented. Input transistors operate in the triode region to achieve programmable voltage-to-current conversion. These transistors are kept in the triode region by a novel negative feedback loop which features simplicity, low voltage requirements, and high output resistance. A linearity analysis is carried out which demonstrates how the proposed transconductance tuning scheme leads to high linearity in a wide transconductance range. Measurement results for a 0.5 μm CMOS implementation of the transconductor show a transconductance tuning range of more than a decade (15 μA/V to 165 μA/V) and a total harmonic distortion of −67 dB at 1 MHz for an input of 1 Vpp and a supply voltage of 1.8 V.
منابع مشابه
Nano-power tunable bump circuit using wide-input-range pseudo-differential transconductor
ELECT An ultra-low-power tunable bump circuit is presented. It incorporates a novel wide-input-range tunable pseudo-differential transconductor linearised using the drain resistances of saturated transistors. Measurement results show that the transconductor has a 5 V differential input range with <20% of linearity error. The bump circuit demonstrates tunability of the centre, width and height, ...
متن کاملNew CMOS Fully-Differential Transconductor and Application to a Fully-Differential Gm-C Filter
Mohamed O. Shaker et al. 175 A new CMOS voltage-controlled fully-differential transconductor is presented. The basic structure of the proposed transconductor is based on a four-MOS transistor cell operating in the triode or saturation region. It achieves a high linearity range of ± 1 V at a 1.5 V supply voltage. The proposed transconductor is used to realize a new fully-differential Gm-C low-pa...
متن کاملA Tunable Pseudo-Differential OTA With dB THD Consuming 1.25 mW
A novel linear tunable transconductor based on a combination of linearization techniques is presented. The input signal is transferred to the – conversion element by means of a high-speed feedback loop. Then, the linear – conversion is accomplished using quasi-floating-gate MOS transistors biased in the triode region. Finally, the absence of current mirrors in the signal path provides low sensi...
متن کاملRail-to-Rail Class AB CMOS Tunable Transconductor with -52dB IM3 at 1MHz
A novel CMOS tunable transconductor is presented. The circuit operates in classAB hence featuring power efficiency. The internal feedback employed and the use of a linearized triode transistor for voltage-to-current conversion allows achieving high linearity. Rail-to-rail input range is obtained by using floatinggate transistors. Measurement results for a test chip prototype in a 0.5μm standard...
متن کاملLinear low voltage nano-scale CMOS transconductor
This paper presents a high linearity MOSFETonly transconductor based on differential structures. While a precise BSIM4 transistor model is introduced through analysis, the linearity can be improved by mobility compensation techniques as the device size is scaled down in the nano-scale CMOS technology. When the compensation utilizes transistors in subthreshold region, rather than the transistors...
متن کامل