Open Access. Powered by Scholars. Published by Universities.®

Electronic Devices and Semiconductor Manufacturing Commons™

Open Access. Powered by Scholars. Published by Universities.®

Selected Works

Switch

Publication Year

Articles 1 - 5 of 5

Full-Text Articles in Electronic Devices and Semiconductor Manufacturing

Design And Modeling Of A 40w Microwave Switch In Qfn 2x2 Package, Chin-Leong Lim Nov 2010

Design And Modeling Of A 40w Microwave Switch In Qfn 2x2 Package, Chin-Leong Lim

Chin-Leong Lim

This paper describes a Quad Flat Non-lead (QFN 2x2) packaged PIN diode switch that is capable of handling Continuous Wave (CW) power up to 40W and WCDMA signal up to 10W. The target application is the Transmit arm of a Transmit Receive switch for cellular base-stations. The part was developed in response to this market segment's aggressive cost-cutting pressure. Prior designs relied on more expensive ceramic packages.

Go to article

Lna With A Bypass Mode Improves Overload Resistance For Mobile Tv, Chin-Leong Lim Mar 2010

Lna With A Bypass Mode Improves Overload Resistance For Mobile Tv, Chin-Leong Lim

Chin-Leong Lim

Objective: This paper describes how a Microwave Monolithic Integrated Circuit (MMIC) can be paired with an external PIN diode bypass switch in the implementation of a Low Noise Amplifier (LNA) with overload protection feature for mobile TV receiver applications.

Method: In the preliminary phase of the design, competing schemes for reducing LNA gain were reviewed and their respective cost-performance trade-offs were benchmarked against the customer’s set of requirements. Based on the selected design, a “proof of concept” prototype was then assembled and tested.

Material: The key components of this switch by-passable LNA were sourced from in-house product portfolio, consisting of …

Go to article

Design A Pin Diode Switch For High-Linearity Applications, Chin-Leong Lim Jul 2008

Design A Pin Diode Switch For High-Linearity Applications, Chin-Leong Lim

Chin-Leong Lim

This paper describes the semiconductor technology, packaging and characterization of a new PIN diode for switching WCDMA signal up to 10W. PIN semiconductor technology was picked as the basis for this switch because of the various performance and reliability advantages that can be had. A model for the PIN diode is generated based on the measured RF performance. How the various model parameters affect the RF performance is also discussed. This is followed by an application description of a 2.0 GHz switch based on the said model and a discussion of some circuit changes to further improve the performance. The …

Go to article

Rf Applications Of Pin Diodes, Chin-Leong Lim Jun 2008

Rf Applications Of Pin Diodes, Chin-Leong Lim

Chin-Leong Lim

PIN diodes are the ubiquitous "nuts & screws" components that hold together RF equipment as varied as the television, radio, 2-way radios, WLAN equipment etc. This talk covers PIN diode characteristics and RF applications such as switches, attenuators and limiters. Performance improvement techniques will also be discussed.

Go to article

Tackle Wideband Rf Switching With Pin Diodes, Chin-Leong Lim Jan 2007

Tackle Wideband Rf Switching With Pin Diodes, Chin-Leong Lim

Chin-Leong Lim

PIN diodes make cheaper, faster and more reliable RF switches than the mechanical competition. The two methods of constructing PIN diodes, bulk and epitaxial, result in significantly different bias current, linearity and lower frequency limit. This paper compares the wideband series switching performances of a bulk PIN diode (w = 22.5 um, Tau = 300 ns) and an epitaxial diode (w = 6.5 um, Tau = 180 ns) in similar low-cost, miniature SOD-323 packages. Through simulation and experiment, we detected significant differences in insertion loss, isolation, and third-order intercept (IP3) performances between the two diode types. In conclusion, the design …

Go to article