Accurate dB-Linear Variable Gain Amplifier With Gain Error Compensation

Choi, Injun; Seo, Heesong; Kim, Bumman

doi:10.1109/jssc.2012.2227606

Cited by 67 publications

(30 citation statements)

References 14 publications

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“…(9), is used to compare VGA1 and VGA2, the best FOM for VGA1 is 15 fJ/Conv. , and the best FOM for VGA2 is 28 fJ/Conv.…”

Section: Resultsmentioning

confidence: 99%

“…There are different types of VGAs for a wide range of applications; examples include the Gilbert-based VGA [4], differential current-steering VGA [5,6], currentsource steering VGA [7], source-degeneration VGA [8], trans-conductance-tuning VGA [9], resistive feedback VGA [10], switched-capacitor feedback VGA [11], and integrating VGA [4][5][6][7]12] need an exponential voltage generator to control the node voltage and realize the dBin-linear gain control; their gain tuning is continuous, and they are typically applied to high data rates [8]. Employs a master-slave control circuit to bias the MOS transistor in the sub-threshold region and achieve exponential voltage-to-current conversion.…”

Section: Introductionmentioning

confidence: 99%

“…Employs a master-slave control circuit to bias the MOS transistor in the sub-threshold region and achieve exponential voltage-to-current conversion. A MOS transistor is biased in the triode region to tune the trans-conductance of the VGA in [9], and an exponential voltage generator is required. [8,9] could be sensitive to process variations because the threshold voltage can change by hundreds of millivolts (mV) [10][11][12] are OTA-based VGAs; for these VGAs, it is difficult to significantly lower the power dissipation while maintaining good noise performance.…”

Section: Introductionmentioning

confidence: 99%

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Inverter-based low-noise, 150 µW single-ended to differential SC-VGAs for second harmonic cardiac ultrasound imaging probes

Wang

Ytterdal

2015

Analog Integr Circ Sig Process

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This paper presents two inverter-based lownoise, low-power, single-ended to differential switchedcapacitor variable gain amplifiers (SC-VGAs) for 2-6-MHz second harmonic cardiac ultrasound imaging probes fabricated with 0.18 lm complementary metal-oxidesemiconductor technology. By employing inverters in class C mode instead of operational trans-conductance amplifiers, the power consumption of 150 lW at a supply voltage of 1 V is achieved for both VGAs; -75 and -72 dBm of integrated noise with 2-6-MHz bandwidth at maximum gain and a sampling frequency of 30 MHz are achieved for VGA1 and VGA2, respectively. Both VGAs have two stages. VGA1 uses a fully switched-capacitor approach for gain control, and the gain range is -21-21 dB with 12-bit capacitor arrays. VGA2 adopts an inverter-based SC-VGA in the first stage with a 6-bit capacitor array to tune the gain from -9 to 9 dB, and the second stage is a differential amplifier with a 4-bit thermometer-coded resistor array to tune the gain from 0 to 13 dB. Both SC-VGAs complete the single-ended to differential conversion in the second stage to suppress the second harmonic distortion (HD2). Both VGAs have HD2 less than -50 dB. The die size of VGA1 is 245 lm 9 134 lm, and the die size of VGA2 is 109 lm 9 164 lm.

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“…(9), is used to compare VGA1 and VGA2, the best FOM for VGA1 is 15 fJ/Conv. , and the best FOM for VGA2 is 28 fJ/Conv.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Inverter-based low-noise, 150 µW single-ended to differential SC-VGAs for second harmonic cardiac ultrasound imaging probes

Wang

Ytterdal

2015

Analog Integr Circ Sig Process

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“…According to our survey, the VGA/PGA circuits presented so far in open literature were supplied with relatively large voltages, ranging from 1 V for ULP biomedical circuits [7], to several volts for high-frequency VGAs devoted to communication receivers [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Their architectures are rather not suitable for sub 0.5-V supply, because such a low supply voltage imposes specific design constraints and challenges.…”

Section: Introductionmentioning

confidence: 99%

0.3‐V bulk‐driven programmable gain amplifier in 0.18‐µm CMOS

Kulej

Khateb

2016

Circuit Theory & Apps

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A new solution for an ultra low voltage bulk-driven programmable gain amplifier (PGA) is described in the paper. While implemented in a standard n-well 0.18-μm complementary metal-oxide-semiconductor (CMOS) process, the circuit operates from 0.3 V supply, and its voltage gain can be regulated from 0 to 18 dB with 6-dB steps. At minimum gain, the PGA offers nearly rail-to-rail input/output swing and the input referred thermal noise of 2.37 μV/Hz 1/2 , which results in a 63-dB dynamic range (DR). Besides, the total power consumption is 96 nW, the signal bandwidth is 2.95 kHz at 5-pF load capacitance and the thirdorder input intercept point (IIP 3 ) is 1.62 V. The circuit performance was simulated with LTspice. Copyright

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“…A UTOMATIC gain control (AGC) is an essential block in many applications such as wireless receivers, disk drive read channels, and hearing aid instruments to maintain a fixed output for different input signal levels [1]- [5]. Conventional AGCs adopt a closed-loop feedback scheme to settle the desired output signal level, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Fast-Settling Feedforward Automatic Gain Control Based on a New Gain Control Approach

Cheng

Xie

Zhang

et al. 2014

IEEE Trans. Circuits Syst. II

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This brief presents a feedforward automatic gain control (AGC) circuit with a short settling time. The proposed AGC combines a digital coarse gain setting and an analog fine gain setting, in which the fine gain setting is carried out by a one-step algorithm, which shortens the settling time drastically. The chip is fabricated in 0.13-μm CMOS technology and the measurement results show that the 48-dB AGC converges to the desired level within 1.2 μs.Index Terms-Automatic gain control (AGC), fast-settling, feedforward, variable gain amplifier (VGA).

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Accurate dB-Linear Variable Gain Amplifier With Gain Error Compensation

Cited by 67 publications

References 14 publications

Inverter-based low-noise, 150 µW single-ended to differential SC-VGAs for second harmonic cardiac ultrasound imaging probes

Inverter-based low-noise, 150 µW single-ended to differential SC-VGAs for second harmonic cardiac ultrasound imaging probes

0.3‐V bulk‐driven programmable gain amplifier in 0.18‐µm CMOS

Fast-Settling Feedforward Automatic Gain Control Based on a New Gain Control Approach

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