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A versatile building block: the CMOS differential difference amplifier,” SolidState Circuits
 IEEE Journal of
, 1987
"... ..."
A 1.2V reactivefeedback 3.110.6 GHz lownoise amplifier
 in 0.13�� CMOS”, IEEE JSSC
, 2007
"... Abstract—A 15.1 dB gain, 2.1 dB (min.) noise figure lownoise amplifier (LNA) fabricated in 0.13 m CMOS operates across the entire 3.1–10.6 GHz ultrawideband (UWB). Noise figure variation over the band is limited to 0.43 dB. Reactive (transformer) feedback reduces the noise figure, stabilizes the g ..."
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Abstract—A 15.1 dB gain, 2.1 dB (min.) noise figure lownoise amplifier (LNA) fabricated in 0.13 m CMOS operates across the entire 3.1–10.6 GHz ultrawideband (UWB). Noise figure variation over the band is limited to 0.43 dB. Reactive (transformer) feedback reduces the noise figure, stabilizes the gain, and sets the terminal impedances over the desired bandwidth. It also provides a means of separating ESD protection circuitry from the RF input path. Bias currentreuse limits power consumption of the 0.87 mm2 IC to 9 mW from a 1.2 V supply. Comparable measured results are presented from both packaged and wafer probed test samples. Index Terms—Bias currentreuse, broadband amplifier, lownoise amplifier, monolithic transformer, reactive feedback, ultrawideband. I.
The Implementation of a System Description Language and its Semantic Functions
, 1991
"... Contents 1 Introduction 9 1.1 Current system description languages . . . . . . . . . . . . . . . . . 9 1.2 Formal function theory . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.3 Interpretation of formal functions . . . . . . . . . . . . . . . . . . . . 11 1.4 Semantic functions . . . . . . ..."
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Cited by 7 (6 self)
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Contents 1 Introduction 9 1.1 Current system description languages . . . . . . . . . . . . . . . . . 9 1.2 Formal function theory . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.3 Interpretation of formal functions . . . . . . . . . . . . . . . . . . . . 11 1.4 Semantic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 1.5 System semantics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 1.6 Adirectional systems . . . . . . . . . . . . . . . . . . . . . . . . . . 14 1.7 Applications of system semantics . . . . . . . . . . . . . . . . . . . . 14 1.8 The ESPRIT project FORFUN . . . . . . . . . . . . . . . . . . . . . 14 1.9 The contents of this thesis . . . . . . . . . . . . . . . . . . . . . . . . 16 2 Mathematical background 17 2.1 Overview of mathematical notation used . . . . . . . . . . . . . . . . 18 2.2 Formal function theory . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.3 Formal language theory . . . . . . . . . . . . . . . . . . . . .
Finding all elementary circuits exploiting transconductance
 IEEE Trans. Circuits Syst. II
, 2001
"... Abstract—Commonly used elementary circuits like singletransistor amplifier stages, the differential pair, and current mirrors basically exploit the transconductance property of transistors. This paper aims at finding all elementary transconductancebased circuits. For this purpose, all graphs of ..."
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Cited by 7 (2 self)
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Abstract—Commonly used elementary circuits like singletransistor amplifier stages, the differential pair, and current mirrors basically exploit the transconductance property of transistors. This paper aims at finding all elementary transconductancebased circuits. For this purpose, all graphs of twoport circuits with one or two voltage controlled current sources are generated systematically. This results in 150 graphs of “finite transactance twoport circuits ” with at least one nonzero transmission parameter. Each of them can be implemented in various ways using transistors and resistors, covering many commonly required types of twoports. To illustrate the usefulness of the technique several alternative circuit implementations for current amplifiers and voltage followers are generated. A new wideband lownoise amplifier generated with the technique was realized in 0.35 m CMOS. Index Terms—Analog circuit design, circuit synthesis, circuit topology, computeraided design, systematic circuit generation, transconductor, voltagecontrolled current source. I.
Roermund, “Lowvoltage lowpower fullyintegratable automatic gain controls,” Analog Int
 Circuits Signal Process
, 1995
"... AbstiuctIn this paper, the frontend of a universally applicable analog integrated circuit for hearing instruments is presented. This IC comprises the following functions: a microphone preamplifier, a pickupcoil preamplifier, a secondorder highpass filter and a. secondorder lowpass filter, b ..."
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Cited by 5 (4 self)
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AbstiuctIn this paper, the frontend of a universally applicable analog integrated circuit for hearing instruments is presented. This IC comprises the following functions: a microphone preamplifier, a pickupcoil preamplifier, a secondorder highpass filter and a. secondorder lowpass filter, both with a controllable cutoff frequency, and an inputcontrolled automatic gain control with an adjustable knee level. By applying a compression/expansion system and operating all the circuits in the current domain as much as possible, all these functions can be implemented in a single IC, without the need for external components. The test chip demonstrates operation down to 1.05 V and a current consumption between 120 and 175 PA. The fullcustom chip area in a 2.5pm BiCMOS process (using only vertical NPN’s and lateral PNP’s) amounts to 2.4 mm’. I.
A Design Strategy for the Synthesis of HighPerformance Instrumentation Amplifiers
, 1996
"... In this paper, the design strategy for a circuit synthesis program is described. Unlike other synthesis programs, the program searches in an extremely large set of possible circuits (over 1,000,000 possible circuit configurations), and is not restricted to one device technology. It uses ..."
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In this paper, the design strategy for a circuit synthesis program is described. Unlike other synthesis programs, the program searches in an extremely large set of possible circuits (over 1,000,000 possible circuit configurations), and is not restricted to one device technology. It uses
HF Low Noise Amplifiers with Integrated Transformer Feedback
 Proc. ISCAS 2002
, 2001
"... Matching networks are often used at the input of low noise amplifiers to match the input impedance to the source. Generally this matching results in a nonoptimal noise behavior. In addition the matching network itself often generates a significant amount of noise. This paper proposes a wideband LN ..."
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Matching networks are often used at the input of low noise amplifiers to match the input impedance to the source. Generally this matching results in a nonoptimal noise behavior. In addition the matching network itself often generates a significant amount of noise. This paper proposes a wideband LNA, based on doubleloop negative feedback, that has an inherent matched input impedance. It offers the possibility to design and bias the input transisitor for maximum noise performance, and has the potential to increase linearity, without affecting the input impedance. An integrated HF transformer is used in one of the feedback loops and the effects of transformer nonidealities on noise behavior, input impedance and bandwidth are investigated.
Input Stages for Amplifiers Connected to VeryLow Or VeryHigh Impedance Signal Sources
, 1999
"... In this paper, the design of linear amplifiers for current sources with very low, or voltage sources with very high impedance is discussed. In designing negativefeedback amplifiers for these sources, the loopgain is often low as a result of the source impedance, thus making it di#cult to obtain a s ..."
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In this paper, the design of linear amplifiers for current sources with very low, or voltage sources with very high impedance is discussed. In designing negativefeedback amplifiers for these sources, the loopgain is often low as a result of the source impedance, thus making it di#cult to obtain a su#ciently high bandwidth. Here, it is proposed to use CB or CC stages in front of a negativefeedback amplifier. It turns out that the use of these stages does not have to have large detrimental e#ects on noise or distortion properties, while providing a good means to achieve a higher bandwidth. Moreover, the system becomes more robust to source parameter variations. Keywords linear amplifiers, bandwidth optimization, structured electronic design I. Introduction In this paper, the design of linear amplifiers for current sources with a low impedance or voltage sources with a high impedance is discussed. As an example, if a negativefeedback amplifier is to be designed for a very low imp...
by using the openloop gainpoles
"... A CAD application for optimising the bandwidth in the structured design of negativefeedback amplifiers ..."
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A CAD application for optimising the bandwidth in the structured design of negativefeedback amplifiers
A CAD Tool for Automated Bandwidth Design of Negative Feedback Amplifiers
"... Abstract — Structured design has raised as an alternative to the traditional and design approach. In the structured design, the process starts by establishing the ideal solution, which obviously fulfills a set of specifications. Hereafter, the design procedure consists in achieving a series of modif ..."
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Abstract — Structured design has raised as an alternative to the traditional and design approach. In the structured design, the process starts by establishing the ideal solution, which obviously fulfills a set of specifications. Hereafter, the design procedure consists in achieving a series of modifications to the ideal solution until the specs are met. One of the key topics in the design of amplifiers is to reach a desired bandwidth (BW). This work focuses on the automation of BW design for negative feedback amplifiers through the synthesis of the nullor with active devices based on the guidelines provided by structured design. I.