Monolithically integrated CMOS current-mode transimpedance preamplifier

Tao, Rui; Berroth, Manfred; Wang, Z.G.

doi:10.1049/el:20031174

Cited by 7 publications

(7 citation statements)

References 4 publications

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“…where g m2 is the transconductance of M 2 and C X denotes the equivalent series of C D and (A+1)·C F , as given by (3) can be interpreted as the amplifier routes the input photocurrent signal to the drain of M 2 and amplifies it by R 2 ; and the bandwidth expression in equation (4) reveals that the bandwidth is mainly decided by g m2 and C X , while insensitive to R 2 tuning. This is achieved by splitting the output node and the feedback node, which correspond to the drain and source of M 2 respectively.…”

Section: A Transimpedance Amplifier Designmentioning

confidence: 99%

“…Typical common-source, transimpedance feedback amplifiers topologies [2][3] employing tunable feedback resistance to implement gain control, and thus widen dynamic range, are difficult to stabilize and often result in a non-optimal design. To reduce the sensitivity of the front-end amplifier to input capacitance, alternative current-mode approaches such as the common-gate (or bipolar common-emitter) TIA have been reported [4]. However, isolating the large capacitance associated with wide FOV detectors requires a large common-gate transconductance, resulting in large junction capacitances, and optical sensitivity and power penalties.…”

Section: Introductionmentioning

confidence: 99%

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An analog front-end receiver with desensitization to input capacitance for free space optical communication

Zhang

Joyner

2008

2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing

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Optical wireless (OW) communication links are emerging as a promising broadband wireless access technology. This paper presents an analog front-end receiver that is designed to overcome challenges faced by high-speed optical wireless links requiring wide field-of-view (FOV), high dynamic range imaging receivers for signal acquisition/ tracking. This receiver employs a capacitive feedback transimpedance amplifier (TIA), with a self-biased automatic gain control (AGC) circuit to increase the input dynamic range. The receiver is designed for integration with wide FOV detectors with associated capacitance up to 5pF and its performance is insensitive (within 5%) to an order of magnitude variation in input capacitance. The self-biased AGC allows 42dB dynamic range in received optical power to accommodate varying link ranges and different OW system configurations. The receiver achieves a maximum gain of 52dBΩ, -3dB bandwidth of 523MHz at 5pF input capacitance, and variable TIA gain from 52dBΩ to 32dBΩ without instability. The input referred noise is 18.6pA/√Hz for 5pF input capacitance. The front-end receiver is implemented in a 0.5μm CMOS process and occupies an area of 0.06mm 2 not including pads.I.

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Section: A Transimpedance Amplifier Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An analog front-end receiver with desensitization to input capacitance for free space optical communication

Zhang

Joyner

2008

2008 6th International Symposium on Communication Systems, Networks and Digital Signal Processing

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“…The trans-impedance amplifier is commonly used in optical receivers due to its ability to provide high transimpedance gain, wide bandwidth, low-input referred noise and low input impedance. The conventional designed circuits are common source, common drain or common gate followed by a source follower stage with large resistor feedback from the output to the input [15]. The parasitic capacitor of the photodiode directly affects the bandwidth and the input noise of the circuit.…”

Section: Introductionmentioning

confidence: 99%

Low-Noise Front-End Receiver Dedicated to Biomedical Devices: NIRS Acquisition System

Chaddad¹

2014

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This paper concerns the design and the implementation of a fully integrated front-end intended to Near-Infrared Spectroscopy System (NIRS) acquisition system. A low-noise transimpedance amplification (TIA) circuit followed by adjustable cutoff frequency and a low-pass filter (LPF) was implemented in order to decrease noise circuit of NIRS detectors. For TIA, a single ended common source, common gate input stage based on a cascode structure is used to get a higher gain-bandwidth closed-loop transimpedance amplifier. To enhance the circuit noise performance, a single feedback transistor technique is used, compared to passive feedback, to achieved high quality data from NIRS acquisition channel. The proposed LPF combines two control methods to adjust the low cutoff frequency. Simulation results show a TIA gain of 104.2 dBΩ, −3dB bandwidth of 19 MHz and an equivalent input noise current spectral density of 446 fA/√Hz. LPF filter exhibits a relatively constant noise 201nV/√Hz from 0 Hz to 700 KHz and linearity performance over its entire tuning range. The proposed front-end of NIRS preamplifier is implemented using 0.18 µm CMOS technology.

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“…Typical common-source, transimpedance feedback amplifiers topologies [2][3] employing tunable feedback resistance to implement gain control, and thus widen dynamic range, are difficult to stabilize and often result in a non-optimal design. To reduce the sensitivity of the front-end amplifier to input capacitance, alternative current-mode approaches such as the common-gate (or bipolar common-emitter) TIA have been reported [4]. However, isolating the large capacitance associated with wide FOV detectors requires a large commongate transconductance, resulting in large junction capacitances, and optical sensitivity and power penalties.…”

Section: Introductionmentioning

confidence: 99%

A 700Mbit/s CMOS capacitive feedback front-end amplifier with automatic gain control for broadband optical wireless links

Zhang

Joyner

Yun

et al. 2008

2008 IEEE International Symposium on Circuits and Systems (ISCAS)

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Optical wireless (OW) communication links are emerging as a promising broadband wireless access technology. This paper presents a transimpedance-limiting amplifier (TIA-LA) analog front-end to overcome challenges faced by high-speed optical wireless links requiring wide field-of-view (FOV), high dynamic range imaging receivers for signal acquisition/tracking. The front-end amplifier presented consists of a transimpedance amplifier combined with a limiting amplifier and, for the first time, employs a self-biased automatic gain control (AGC) circuit within a capacitive feedback configuration TIA. The front-end is designed for integration with wide FOV detectors with associated capacitance up to 5pF and its performance is insensitive (within 10%) to an order of magnitude variation in input capacitance. The self-biased AGC allows 40dB dynamic range in received optical power to accommodate varying link ranges and different OW system configurations. The TIA-LA achieves a maximum total gain of 66 dB , -3dB bandwidth of 540 MHz at 5pF detector capacitance, and variable TIA gain from 53 dB to 42 dB without instability. The expected sensitivity of this optical receiver front-end is -20.1dBm at a BER of 10 -12 and total power dissipation of 209mW from dual 3.3V and 1.8V supply voltages in a 0.5um CMOS process.I.

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Monolithically integrated CMOS current-mode transimpedance preamplifier

Cited by 7 publications

References 4 publications

An analog front-end receiver with desensitization to input capacitance for free space optical communication

An analog front-end receiver with desensitization to input capacitance for free space optical communication

Low-Noise Front-End Receiver Dedicated to Biomedical Devices: NIRS Acquisition System

A 700Mbit/s CMOS capacitive feedback front-end amplifier with automatic gain control for broadband optical wireless links

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