A Wide-Band UHF Logarithmic Amplifier

Rubin, S.N.

doi:10.1109/jssc.1966.1049762

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…There are two different approaches for logarithmic amplifier, one uses nonlinear feedback and another is successive detection [5]- [6]. The successive detection logarithmic amplifier (SDLA) as depicted in Fig.…”

Section: Circuit Descriptionmentioning

confidence: 99%

A linear-in-dB radio-frequency power detector

Hsu

Lai

et al. 2011

2011 IEEE MTT-S International Microwave Symposium

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An integrated circuit of radio-frequency power detection by a 0.18ǐm CMOS process with the output voltage linearly proportional to the input power in decibel is presented. The target dynamic range of this radio-frequency power detector design is 40 dB with the log-error being within ±1dB. Whatever the point of view is on dynamic range or logarithmic error, the working range is from DC to 8GHz. The power consumption is less than 70mW. It behaves with wider applicable frequency range and takes lower power consumption as compared to others.Index Terms -CMOS, Cherry-Hooper amplifier, power detector, radar receiver, successive detection logarithmic amplifier, unbalanced source-coupled pairs.

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Section: Circuit Descriptionmentioning

confidence: 99%

A linear-in-dB radio-frequency power detector

Hsu

Lai

et al. 2011

2011 IEEE MTT-S International Microwave Symposium

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High-Speed, Simplified Design of an Image Receiver for Wireless Capsule Endoscopy

Basar¹,

Malek²,

Juni³

et al. 2013

PIER B

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Abstract-Just over a decade ago, wireless capsule endoscopy (WCE) was introduced as a novel alternative to conventional wire or probe endoscopy to examine disorders of the human gastrointestinal (GI) tract. Yet, the persistent inability of transmitting high-quality images due to limited data rate of the telemetry system continues to be an issue of major concern. Thus, high-data-rate telemetry systems are essential due to the widespread use of the WCE technique. In this paper, we present such a telemetry system that includes a highly-simplified receiver for the use in WCE. Unlike the conventional architecture of a radio frequency (RF) receiver, the architecture of the new receiver allows the direct conversion of analog RF signals to digital signals, eliminating the need for any frequency conversion in the analog domain. Our receiver system consists of sub-blocks, a low-noise amplifier (LNA), a logarithmic amplifier (LA), a power detector (PD), and a comparator. The common-source cascode LNA was designed with its frequency spectrum centralized at 450 MHz, which was determined by electromagnetic (EM) simulation of the path loss in the GI tract of the human body. To ensure that the higher data rate, i.e., 100 Mbps, could be attained, the LNA was designed for a system bandwidth of 100 MHz, i.e., 400-500 MHz. The LNA and the three cascading blocks in combination have total gain of 80 dB to compensate for the losses in the weak signals that are received. The LNA and the LA, including the PD and the comparator, require 17-mA and 337-µA currents, respectively, from a 1.5-V, DC source.

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A Wide-Band UHF Logarithmic Amplifier

Cited by 2 publications

References 3 publications

A linear-in-dB radio-frequency power detector

A linear-in-dB radio-frequency power detector

High-Speed, Simplified Design of an Image Receiver for Wireless Capsule Endoscopy

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