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Wideband power amplifiers (PAs) with high power-added efficiency (PAE) are required by software-defined radio and high-data-rate communications. A PA in Class-AB, which can provide linear amplification with PAE better than Class-A, has been reported in [1] to achieve bandwidth larger than one octave. However, Class-AB operation generates a large amount of 2(More)
This paper presents a compact digitally controlled variable gain amplifier (DVGA) with capabilities of both temperature compensated linear-in-decibel (dB-linear) gain control and dc offset cancellation (DCOC) without making use of either the feedback or the feed-forward loop. The proposed DVGA design is a three-stage inductorless cascaded amplifier that is(More)
This paper presents the design and validation of a compact high-performance digitally controlled variable-gain amplifier (DVGA). By using MOS switches and a linearizer, the designed DVGA demonstrates high linearity and gain flatness over a wide gain control range. The 6-bit DVGA is designed in a commercial 0.18-μm SiGe BiCMOS technology achieving a(More)
—In this paper, the design and packaging of fully integrated digitally controlled microelectromechanical system (MEMS) filters with low cost, high performance, and compact size are introduced. The four-channel switched filters operating in the frequency range of 11–20 GHz have been developed using MEMS technologies and four five-pole edge-coupled bandpass(More)
A new type of low-pass filter (LPF) with ultra-wide band rejection and compact size by using a proposed transformed radial stubs (TRSs) is introduced and investigated. The operating mechanism of the filter is investigated based on proposed equivalent-circuit model. The implemented LPF with 1-dB cutoff frequency fc of 3 GHz demonstrates stopband rejection up(More)
This paper presents the design considerations of a silicon-based transmit/receive (T/R) switch for microwave and millimeter-wave frequencies. Techniques for minimizing switch size and loss while increasing linearity are discussed. With the dedicated idea of the standing-wave concept, a combo design of a bandpass filter and switch, called the filtering(More)
Single-pole double-throw (SPDT) switches are a key building block for enabling transceiver time-division duplexing (TDD) when operated as a T/R switch or for eliminating imager fluctuations when operated as a Dicke switch. To provide acceptable compromises of NF, P out and sensitivity in transceivers or imagers, the switches are required to feature an(More)