HMMC-3024 Datasheet, PDF (4/9 Pages) Agilent(Hewlett-Packard) – DC-12 GHz High Efficiency GaAs HBT MMIC Divide-by-4 Prescaler

Input Preamplifier Stage
Post Amplifier Stage
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Figure 1. Simplified Schematic
Applications
The HMMC-3024 is designed for use in
high frequency communications, micro-
wave instrumentation, and EW radar
systems where low phase-noise PLL
control circuitry or broad-band frequency
translation is required.
Operation
The device is designed to operate
when driven with either a single-ended
or differential sinusoidal input signal
over a 200 MHz to 12 GHz bandwidth.
Below 200 MHz the prescaler input is
“slew-rate” limited, requiring fast ris-
ing and falling edge speeds to properly
divide. The device will operate at fre-
quencies down to dc when driven with
a square-wave.
The device may be biased from either a
single positive or single negative sup-
ply bias. The backside of the device is
not dc connected to any dc bias point
on the device.
For positive supply operation V_CC is
nominally biased at any voltage in the
+4.5 to +6.5 volt range with V_EE (or V_EE
& V_PwrSel) grounded. For negative bias
operation V_CC is typically grounded and
a negative voltage between -4.5 to
-6.5 volts is applied to V_EE (or V_EE &
V_PwrSel).
Several features are designed into this
prescaler:
1. Dual-Output Power Feature
Bonding both V_EE and V_PwrSel pads to
either ground (positive bias mode) or
the negative supply (negative bias
mode), will deliver ~0 dBm [0.5 V_p–p]
at the RF output port while drawing
~40 mA supply current. Eliminating
the V_PwrSel connection results in re-
duced output power and voltage swing,
-6.0 dBm [0.25 V_p–p] but at a reduced
current draw of ~30 mA resulting in
less overall power dissipation.
(NOTE: V_EE must ALWAYS
be bonded and V_PwrSel must
NEVER be biased to any potential
other than V_EE or open-circuited.)
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