Optical receiver IC for CD/DVD/blue-laser application

Abstract

In this paper an optoelectronic receiver IC for optical data storage applications is presented. The IC was developed in a 0.5 µm BiCMOS technology with integrated PIN-photodiodes. It includes a new architecture of highspeed and low-noise transimpedance amplifiers with a gain range of 130 Ω to 270 kΩ programmable with a serial interface. The bandwidth is 260 MHz for highest gain which gives a gain-bandwidth-product of 70 THzΩ and a sensitivity improvement by a factor of 2 compared to published OEICs. The amplifiers support a special write/clip mode. The output buffers are 130 Ω impedance matched for optimized data transmission over a flex cable.

A 122 TΩ Hz transimpedance bandwidth product BiCMOS optical sensor front-end with a 54.7 dB voltage-controlled photo-sensitivity range

“…The maximum power consumption P max decreases with the increase of the photo-sensitivity S because of decreasing input photodiode currents I pd flowing through the CCI. The largest power consumption of the proposed OEIC is 1.9, 8.7, 4.7, 1.1 and 1.3 times smaller than that in [2,5,6,8,9], respectively, and 1.3 times larger than that in [7]. The effectiveness of the power consumption saving by involving the novel VCCSs within VCRs R VCR1 and R VCR2 is confirmed in this way.…”

“…where C ZT is the total capacitance at the node Z, R X is the input resistance of the current follower within the CCI at the terminal X, C XT is the total capacitance at the terminal X (including photodiode capacitance C PD ), (1), and taking into account that all of the poles (2)(3)(4)(5) are real and belong to the left half plane, a gain-peak does not exist in the frequency response. Consequently, there is not any stability problem in the proposed design.…”

“…And what adds actually a more severe problem is that these compensation capacitors have to be switched, which leads to bandwidths (and transimpedance-bandwidth product) limitation due to parasitic capacitances of the switching transistors. The second type of variable-gain OEICs is that with current-mode gain-control of OEICs [4][5][6]. Due to exponential transfer characteristics, sensitivity of the current gain on the control voltage can be too large in [5,6].…”

“…The second type of variable-gain OEICs is that with current-mode gain-control of OEICs [4][5][6]. Due to exponential transfer characteristics, sensitivity of the current gain on the control voltage can be too large in [5,6]. This problem does not exist in [4] due to hyperbolic tangent transfer function of the gain-control cell, with one extra negative power supply as a drawback of this design.…”

A BJT translinear loop based optoelectronic integrated circuit with variable transimpedance for optical storage systems

“…Because a transimpedance amplifier (TIA) is part of each OEIC intended for applications in optical storage systems, current-mode signal processing is very convenient to use. One class of these OEICs is based on a variable-gain current amplifier (VGCA) within the TIA [1,2]. Another class is based on current conveyors preceding the voltage-controlled resistors [3,4].…”