Ultra low voltage, high performance operational transconductance amplifier and its application in a tunable Gm-C filter

Rezaei, Farzan; Azhari, Seyed Javad

doi:10.1016/j.mejo.2011.04.012

Cited by 43 publications

(22 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the drain current and the third-order harmonic distortion term of the weak inversion region transistors are expressed as [16]:…”

Section: Transconductance Descriptionmentioning

confidence: 99%

“…The total input referred noise of the proposed OTA, which consists of thermal and flicker noise is derived as [6], [16] and [19]:…”

Section: Noise In the Proposed Circuitmentioning

confidence: 99%

“…Using bulk-driven transistors [15,16], flipped voltage follower cell [17], pseudo-differential pairs [18], floating gate approach, sub-threshold MOSFET [16], and level shifter are some design methods reported for reduced supply voltage analog circuits. Although these techniques ruin most of the OTAs characteristics, such as noise, linearity, open loop DC gain, unity gain bandwidth, and common mode rejection ratio, merging these methods is necessary for ultra low voltage designs.…”

Section: Introductionmentioning

confidence: 99%

“…Although these techniques ruin most of the OTAs characteristics, such as noise, linearity, open loop DC gain, unity gain bandwidth, and common mode rejection ratio, merging these methods is necessary for ultra low voltage designs. For example, in [16], bulk-driven transistors are used in sub-threshold region for ultra low voltage design. Hence, a suitable topology and appropriate bias circuits should be used for getting optimized circuits.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A 0.8‐V supply bulk‐driven operational transconductance amplifier and Gm‐C filter in 0.18 µm CMOS process

Abbasalizadeh

Sheikhaei

Forouzandeh

2014

Circuit Theory & Apps

View full text Add to dashboard Cite

SUMMARYA low voltage bulk-driven operational transconductance amplifier (OTA) and its application to implement a tunable Gm-C filter are presented. The linearity of the proposed OTA is achieved by nonlinear terms cancelation technique, using two paralleled differential topologies with opposite signs in the third-order harmonic distortion term of the differential output current. The proposed OTA uses 0.8 V supply voltage and consumes 31.2 μW. The proposed OTA shows a total harmonic distortion of better than À40 dB over the tuning range of the transconductance, by applying 800 mV ppd sine wave input signal with 1 MHz frequency. The OTA has been used to implement a third-order low-pass Gm-C filter, which can be used for wireless sensor network applications. The filter can operate as the channel select filter and variable gain amplifier, simultaneously. The gain of the filter can be tuned from À1 to 23 dB, which results in power consumptions of 187.2 to 450.6 μW, respectively. The proposed OTA and filter have been simulated in a 0.18 μm CMOS technology. Simulations of process corners and temperature variations are also included in the paper.

show abstract

“…On the other hand, the drain current and the third-order harmonic distortion term of the weak inversion region transistors are expressed as [16]:…”

Section: Transconductance Descriptionmentioning

confidence: 99%

“…The total input referred noise of the proposed OTA, which consists of thermal and flicker noise is derived as [6], [16] and [19]:…”

Section: Noise In the Proposed Circuitmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A 0.8‐V supply bulk‐driven operational transconductance amplifier and Gm‐C filter in 0.18 µm CMOS process

Abbasalizadeh

Sheikhaei

Forouzandeh

2014

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…This becomes more challenging by taking into account that in most applications the linearity enhancement is required in a wide range of transconductances. Moreover, employed technique for linearization should neither increase noise and power consumption nor decrease total achievable transconductance (G m ) [10,[30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

Rezaei

Azhari

2015

Microelectronics Journal

Self Cite

View full text Add to dashboard Cite

Analysis and design of highly linear triode‐mode based OTA and its application to a wide tunable Gm‐C filter

Rezaei

Carvajal

2017

Circuit Theory & Apps

Self Cite

View full text Add to dashboard Cite

In this paper, a new highly linear operational transconductance amplifier (OTA) based on triode-mode input transistors is introduced. An analysis based on theoretical relations and simulation results is presented that aims to obtain the best operating points of triode-mode and cascode transistors to achieve the highest linearity. The proposed analysis is utilized to design a linear pseudo-differential OTA, benefiting a linear common mode feedforward and an appropriate common mode feedback circuit. The common mode feedforward circuit is also regulated in the same manner as main the transconductor to stabilize the output common mode voltage during tuning action and achieve higher common mode rejection ratio. Proposed OTA is used to implement a tunable low-power linear Gm-C filter. The cutoff frequency of the filter is tunable from 2.7 to 44 MHz while its power consumption changes from 3.5 to 8.5 mW in the entire tuning range. By applying input voltages up to 1.1 Vp-p, the filter's IM3 remains less than −48 dB for various cutoff frequencies. The proposed OTA and filter are simulated in 0.18-m CMOS technology with Hspice simulator.

show abstract

Ultra low voltage, high performance operational transconductance amplifier and its application in a tunable Gm-C filter

Cited by 43 publications

References 11 publications

A 0.8‐V supply bulk‐driven operational transconductance amplifier and Gm‐C filter in 0.18 µm CMOS process

A 0.8‐V supply bulk‐driven operational transconductance amplifier and Gm‐C filter in 0.18 µm CMOS process

A new controllable adaptive biasing linearization technique for a CMOS OTA and its application to tunable Gm-C filter design

Analysis and design of highly linear triode‐mode based OTA and its application to a wide tunable Gm‐C filter

Contact Info

Product

Resources

About