6-k/spl Omega/ 43-Gb/s differential transimpedance-limiting amplifier with auto-zero feedback and high dynamic range

A Passive W-Band Imager in 65nm Bulk CMOS

“…From 1.2V, the LNA consumes only 30mA and has over 27dB gain with a 3-dB bandwidth exceeding 10 GHz. The square-law detector utilizes a differential topology similar to [4] and is shown in Figure 3. The input transformer, which is also the output load of the LNA, performs a single-ended to differential conversion.…”

A 2.5-V, 40-Gb/s decision circuit using SiGe BiCMOS logic

“…15 and employs a total of 24 mm-wave inductors and one mm-wave transformer. To obtain adequate self-resonant frequency for mm-wave applications, it is critical to minimize the inductor footprint over the substrate [15]. As each passive device is at most 45 m 45 m, it is feasible to integrate such a large number of them on a single die without consuming an exorbitant area.…”

“…11 is instead employed as a preamplifier for the decision circuit. Amplifiers with transimpedance feedback have only recently been considered as low-noise voltage preamplifiers [15]. The use of shunt feedback lowers the optimal noise impedance, which improves sensitivity in a 50-environment, with minimal current consumption.…”

“…Appropriate choice of the loop gain and feedback resistor resistor results in a broadband impedance match given by (11) A number of mm-wave inductors [16] are employed throughout the circuit to extend bandwidth without excessive power dissipation. The 40-fF pad capacitance is absorbed in an artificial transmission line with input inductor [17], while a feedback inductor filters high-frequency noise from the feedback resistor [15].…”

An SOI CMOS, High Gain and Low Noise TransimpedanceLimiting Amplifier for 10Gb/s Applications

“…Various limiting (LA) and transimpedance amplifier (TIA) designs have been reported to date in technologies ranging from SiGe [1][2][3][4], to InP [5], and to CMOS [6].…”