Telstar 1 included discrete transistors
augmented by a traveling-wave-tube amplifier to reach the required 3-W transmit power.
The one-channel interface driver has a very simple construction of resistors, diodes and Darlington transistors and will replace discrete transistors
in interface circuits.
Gnauck, a scientist doing lightwave work at Bell Labs, some receivers have come very close to the best hybrids where discrete transistors
and discrete photodiodes have been put together in a receiver's front-end.
Lower frequency designs lend themselves to a single layer RF pcb design mounted onto a backplane, with SMT packaged MMICs, and drop-in devices such as circulators or packaged discrete transistors
The RF Micro Devices[R] RF3800 series of driver amplifiers provides up to +37 dBm of output power (P1dB), high power efficiency (> 35 percent at P1dB), high linearity (+50 dBm OIP3) and higher gain (14 to 20 dB) under linear class AB operation, as compared with alternate Si-LDMOS discrete transistors
commonly used in similar infrastructure power amplifier applications.
A technology leap has occurred recently, which compares to the one from discrete transistors
to integrated circuits.
High voltage discrete transistors
with breakdown voltages appropriate to the various national standards are used to connect the DAA chips to the telephone lines.
The splitter and required gain are commonly delivered with amplifier gain blocks or even discrete transistors