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Saw-Less Frequency Division Duplexing and Full-Duplex transceivers require very high receiver linearity. Self-Interference Cancellation can relax the specification but results in very high power. We propose a low-power direct-conversion single-ended receiver with passive SIC. A 28 nm CMOS prototype achieves an effective IIP3 > 25 dBm for both IB and OOB SI with only 20 dB cancellation and 25 dB...
A novel class of filters (called pipe filters) that features in-band noise reduction is presented and a current mode biquad cell based on cross-connected cascoded devices is introduced. The presented solution gives in-band high-pass noise shaping and passive pre-filtering of out-of-band blockers. This results in both low in-band noise and high out-of-band IIP3. A 4th-order lowpass prototype in 90...
In a direct-conversion wireless receiver the baseband filter should be able to handle large blockers, resulting in a very challenging spurious free dynamic range (SFDR) requirement. In particular, the noise added in-band trades off with the linearity required to handle close out-of-band interferers [1]. Since the integrated noise generally is proportional to kT/C, once the noise floor for the filter...
In this paper a 3V 2nd order lowpass continuous-time filter is presented. The filter is based on a highly linear pseudo-differential transconductor. The input common-mode signal is cancelled at the transconductor level using a feed-forward path. The output common-mode voltage is controlled at the filter level using lossy-integrators. A prototype cell has been realized in 1.2??BiCMOS technology. The...
A versatile high-speed Charge Sensitive Preamplifier (CSP) to be used in silicon calorimeters is presented. The main features of this circuit are low noise, high slew-rate (larger than 500V/??s), high dynamic range (of the order of 90dB), and 100?? output drive capability. The bias current of the CSP can be adjusted, in order to optimise the trade-off between power and noise for different operation...
This paper reports on a telephone chip that performs all the basic functions of a speech circuit using only two external components. Precision filtering using Switched Capacitor (SC) techniques is used to implement on-chip impedance termination, hybrid with sidetone cancellation and DC characteristics starting from a single 1% external resistor. Better than 30 dB matching is achieved without any external...
The circuits described in this paper are a line driver and a sensing amplifier. They are part of a Subscriber Line Interface Circuit (SLIC) fabricated in BCD technology that operates up to 100 V. The driver requires about 500 ??A of quiescent current, can sink and source up to 100 mA, and remains stable for all possible line lengths. The sensing amplifier senses the line current to synthesize both...
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