DESCRIPTION
Demonstration circuit 1027A is optimized for downconverting
mixer tests & measurements for input
frequency range of 79MHz to 300MHz and an output
frequency range of 3MHz to 67MHz, (for 12dB return
loss). The LO port frequency range is 176MHz to
316MHz (10dB return loss). Demo circuit 1027A can
also be optimized for HF, VHF up-converting
applications.
The LT®5560 is a 0.01MHz to 4000MHz low power,
high performance broadband Up/Down-converting
active mixer. This double-balanced mixer can be
driven by a single-ended LO source and requires –
2dBm of LO power. The signal ports can be
impedance matched to a broad range of frequencies,
which allow the LT®5560 to be used as an up- or
down-conversion mixer in a wide variety of
applications.
The LT®5560 is characterized with a supply current of
10mA; however, the DC current is adjustable, which
allows the performance to be optimized for each
application by changing the value of resistor R1. For
Icc=10mA the value of R1=3 Ohm. Operation at a
lower supply current will, however, degrade linearity.
Design files for this circuit board are available. Call
the LTC factory.