Chin-Leong Lim
 Write for Microwaves & RF
4 results found for Chin-Leong Lim, displaying items 1 - 4

July 2010   [Components]
Wideband Limiter Fits SOT-323 Pack
Limiters protect wireless receiver front-ends from irreversible damage due to signal overload. By combining Schottky and PIN diodes in a hybrid limiter design that can be mounted in a compact SOT- 323 surface-mount package, it has been possible to develop a low-cost limiter with 1 dB or less insertion loss from 10 MHz to 1.7 GHz with an input-power turn-on threshold (PTH) of only +2 dBm at 450 MHz. To the authorâ??s knowledge, this is the first ...

April 2010   [Components]
PIN Switch Protects LNA From Overloads
Receiver front ends for mobile television must provide the sensitivity needed to operate at far distances from a transmitter, but must provide overload tolerance when in the presence of large signals. Mobile television receive capability, which will be integrated into a large number of portable electronic devices, including cellular handsets, portable digital assistants (PDAs), laptop computers, and in-car-entertainment (ICE)...

April 2008   [Components]
Cut Loss In Low-Voltage, Wideband PIN Attenuators
Variable attenuators based on the pi (p) configuration can be designed with frequency coverage spanning multiple octaves, from the high-frequency (HF) range to the lower microwave region. As a result, they are suitable for numerous wideband applications, such as in satellite television and cable-television (CATV) systems. The use of PIN diodes in these attenuators enables them to be realized as low-cost components and compact alternatives to ...

February 2007   [Components]
Tackle Wideband RF Switching With PIN Diodes
Costly mechanical switches can be justified when used in precision test equipment, such as vector network analyzers. For mass-produced consumer products like cable- or satellite-television (CATV/SATV) delivery systems, however, less-expensive electronic switches are a better fit. These switches are based on either transistors or PIN diodes. The semiconductor switches have no moving parts. As a result, they provide faster response times and longer life spans than their...