11.5 A 100MS/s 10.5b 2.46mW comparator-less pipeline ADC using self-biased ring amplifiers

Lim, Yong; Flynn, Michael P.

doi:10.1109/isscc.2014.6757400

Cited by 27 publications

(15 citation statements)

References 3 publications

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“…Due to the nonlinearity of the circuit, continuous background calibration is necessary. Another alternative amplifier topology is a ring amplifier (RA) [16][17][18]. The speed of the RA-based switched-capacitor circuit is determined by the oscillating frequency, and the maximum sampling rate demonstrated thus far is 100MS/s at a modest 9-bit ENOB [18].…”

Section: Introductionmentioning

confidence: 99%

A 12b 250 MS/s Pipelined ADC With Virtual Ground Reference Buffers

Boo

Boning

Lee

2015

IEEE J. Solid-State Circuits

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The virtual ground reference buffer (VGRB) technique is introduced as a means to improve the performance of switched-capacitor circuits. The technique enhances the performance by improving the feedback factor of the op-amp without affecting the signal gain. The bootstrapping action of the level-shifting buffers relaxes key op-amp performance requirements including unitygain bandwidth, noise, open-loop gain and offset compared with conventional circuits. This reduces the design complexity and the power consumption of op-amp based circuits. Based on this technique, a 12b pipelined ADC is implemented in 65nm CMOS that achieves 67.0dB SNDR at 250MS/s and consumes 49.7mW of power from a 1.2V power supply.

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Section: Introductionmentioning

confidence: 99%

A 12b 250 MS/s Pipelined ADC With Virtual Ground Reference Buffers

Boo

Boning

Lee

2015

IEEE J. Solid-State Circuits

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“…During ϕ1 with the auto-zeroing operation, the input and output of SBRA are connected and storing the offset in C C . Since the load (C L ) is absent in this phase, C aid is introduced to ensure the stability [7]. A reset phase ϕ rst is inserted before ϕ 1 to make the starting point of auto-zeroing independent of the previous input.…”

Section: Selection Of R Smentioning

confidence: 99%

“…For inverter-based amplifier, methods [3], [5]- [6] have been proposed to address this problem which focuses on the biasing techniques but sacrifices the power efficiency in certain level. For the ring amplifier, [7] proposes a self-biased ring amplifier (SBRA), as depicted in Fig. 1 (b), which introduces biasing voltage rather than using a capacitor.…”

Section: Introductionmentioning

confidence: 99%

“…A resistor R S is inserted between the drain of M p2 and M n2 in the 2 nd stage which generates voltages V BP2 and V BN2 to control the range of the dead-zone. The advantage of this implementation over the original is related with the fact that V BP2 and V BN2 can track the variation of the supply voltage in certain level [7] allowing the adjustment of the range of the dead-zone. However, the process and temperature variations are still not addressed which can also induce stability problems in the ring amplifier.…”

Section: Introductionmentioning

confidence: 99%

“…In section 4, simulation results are reported, with the conclusions drawn in section 5. Figure 1 Ring amplifier (a) proposed in [4] (b) self-biased ring amplifier (SBRA) [7].…”

Section: Introductionmentioning

confidence: 99%

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A Calibration Scheme for Stability of Self-biased Ring Amplifier

2017

2017 6th International Conference on Advanced Materials and Computer Science (ICAMCS 2017)

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Abstract. This paper presents a calibration scheme to enhance the robustness of the SelfBiased Ring Amplifier (SBRA) under PVT variations. As the ring amplifier is developed based on a ring oscillator structure, it can easily oscillate under PVT variations. The proposed calibration method utilizes an Oscillation Detection Circuit (ODC) with a close loop control of a Programmable Resistor Array Circuit (PRAC) to adjust the dead-zone (stability region), thus stabilizing the SBRA. The introduced ODC and PRAC have little influence on the power efficiency as well as hardware overhead. Based on a 1.5 bit/stage Multiplying Digital to Analog Converter (MDAC) circuit setup, the simulation shows that the proposed method can stabilize the ring amplifier in the range of 0°C to 85°C at all corners.

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The Ring Amplifier: Scalable Amplification with Ring Oscillators

Hershberg¹,

Moon

2014

High-Performance AD and DA Converters, IC Design in Scaled Technologies, and Time-Domain Signal Processing

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11.5 A 100MS/s 10.5b 2.46mW comparator-less pipeline ADC using self-biased ring amplifiers

Cited by 27 publications

References 3 publications

A 12b 250 MS/s Pipelined ADC With Virtual Ground Reference Buffers

A 12b 250 MS/s Pipelined ADC With Virtual Ground Reference Buffers

A Calibration Scheme for Stability of Self-biased Ring Amplifier

The Ring Amplifier: Scalable Amplification with Ring Oscillators

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