2Doherty amplifier: An RF amplifier that consists of two types of amplifiers: a carrier amplifier
that is in continuous operation and a peak amplifier that supports the carrier amplifier
when the output power is high.
We anticipate growing shipments of Spectrian's PCS 1800 CDMA single carrier amplifier
to LGIC this quarter and continued strong demand from the Korean market for PCS 1800 single carrier amplifiers
this year," he added.
The fundamental Doherty architecture uses two parallel, equal power split transistors, a carrier amplifier
transistor for low level signals and a peaking amplifier transistor for high level signals.
The new products satisfy the unique requirements of the Doherty amplifier architecture, in which a carrier amplifier
operating in Class AB mode is combined with a peaking amplifier operating in the higher-efficiency Class C mode.
The RF power transistors in Doherty amplifiers must provide excellent output impedance matching under both linear operating conditions in which the RF drive level of the carrier amplifier
is "backed-off" to ensure high linearity and efficiency, as well as during peak (maximum) signal conditions handled by the peaking amplifier.
Our goal at Powerwave is to continue to leverage our core multi carrier amplifier
technology with innovative solutions that offer increasing levels of functionality for our customers.
Spectrian Corporation (Nasdaq: SPCT), a leader in the design and manufacture of power amplifiers and semiconductor devices for wireless base stations, today announced that the forecasted orders for a product in its single carrier amplifier
line have been delayed to later this year.
Powerwave's MCPA Boosters represent a significant improvement over traditional GSM site expansion using single carrier amplifiers
and high-power hybrid combining.