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The crowded radio spectrum allocated for 3G/4G mobile communication, together with the growing demand for higher data-rates, has led to the situation where transceivers need to support FDD operation in multiple frequency bands with different TX-RX duplex spacing. In order to reduce costs and enable SAW-less operation, many recent transmitter implementations have thus targeted stringent out-of-band...
In comparator-based switched-capacitor circuits, OTAs are replaced by comparators and current sources. Instead of an OTA forcing a virtual ground condition, a comparator steers current sources until it detects a virtual ground. Different possibilities to use this principle in a ΔΣ A/D converter are evaluated. A pseudo-differential implementation with preset minimizes the requirements for the comparator...
A SAW-less discrete-time superheterodyne receiver (RX) with multi-stage harmonic rejection in 28nm CMOS, featuring highly linear LNTA, employs a novel blocker-resilient octal charge-sharing band-pass filter to achieve low power consumption. The RX features NF of 2.1 to 2.6 dB, and IIP3 of 8 to 14 dBm, while drawing only 24 to 37 mW in different operating modes.
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