By Tien-Yu Lo, Chung-Chih Hung (eds.)
1V CMOS Gm-C Filters: layout and Applications discusses the layout facets of transconductor and Gm-C filter out circuits, with a different specialise in 1V circuit implementations. The emphasis is on excessive linearity voltage-to-current blocks for instant and wireline functions, and the designs conceal as much as very excessive velocity specifications.
1V CMOS Gm-C Filters: layout and Applications begins with a common creation to the recommendations of transconductors. The evaluate of the final architectures is supplied, starting from shunt suggestions to floating gate topologies. a number of transconductors according to nano-scale applied sciences are mentioned with distinctive attentions to the quick channel influence. The performances are optimized whereas taking velocity, linearity and tool intake under consideration. The implementation of the Gm-C filter out is brought following the transconductors. The filter out synthesis and non-ideal results as a result of lively units are analyzed. 3 Gm-C filters are carried out for channel choice in instant receivers, and all of those filters function below a number of modes to avoid wasting chip region. the objective purposes are IEEE 802.11a/b/g instant LANs, Wideband CDMA, cdma2000, and Bluetooth. additionally, the excessive velocity filter out required for pulse sign interface can be mentioned. numerous excessive pace filters are carried out with systematic layout approaches. The layout and dialogue of computerized tuning platforms are incorporated as well.
1V CMOS Gm-C Filters: layout and Applications presents a transparent advent of low voltage architectures and yields perception into the impression of circuit non-idealities. The totally CMOS implementation should be beneficial for instant and wireline purposes. the fundamental layout strategies may be simply built during the representation of this booklet. This booklet should be supplied for engineers and researchers who're drawn to the transconductor and Gm-C filter out. it's also a superb reference for the path regarding analog built-in circuit design.
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Extra info for 1V CMOS G m -C Filters: Design and Applications
However, the value varies under process fabrication, and an automatic tuning circuit is required. The main function of the automatic tuning circuit is discussed in Chapter 5. The unity-gain frequency is dependent on the transconductance and the loading capacitor. Adjustable transconductor or capacitor is required to compensate process corner variation. Thus, we can keep transconductance constant and vary the capacitance or vice versa. These approaches are called constant-Gm and constant-CL , respectively.
Transconductance tuning could be achieved by a MOS operating in the linear region. The transconductor fabricated in the 180 nm CMOS process occupies a small area of 4:5 10 3 mm2 . The measured third-order inter-modulation distortion with a 400 mVpp differential input under 1-V supply remains below 52 dB for frequency up to 50 MHz. 5 mW. The experimental results demonstrate good agreement with theoretical analyses. 1 Introduction The circuit that converts the applied input voltage into current at output nodes is generally referred to as a V-I converter or transconductor.
The third-order inter-modulation distortion measured with two sinusoidal tones of 400 mVpp amplitude is shown in Fig. 28. The IM3 is shown to be less than 52 dB at the speed of 50 MHz and drops to 50 dB atp56 MHz. The measured input referred noise spectral density at 50 MHz is 13 nV= Hz. 2 summarizes the performance of this work with recently reported works. 5 Linear CMOS Transconductor in Nano-Scale CMOS Technology 37 Fig. 4 Summary A novel pseudo-differential transconductor based on a mobility compensation technique has been fabricated and measured.
1V CMOS G m -C Filters: Design and Applications by Tien-Yu Lo, Chung-Chih Hung (eds.)