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ADMV1011

Data Sheet

Rev. A | Page 18 of 26

THEORY OF OPERATION

The ADMV1011 is a GaAs, MMIC, double sideband upconverter

in a RoHS compliant package optimized for upper sideband

and lower sideband point to point microwave radio applications

operating in the 17 GHz to 24 GHz output frequency range. The

ADMV1011 supports LO input frequencies of 8 GHz to 12 GHz

and IF input frequencies of 2 GHz to 4 GHz.

The ADMV1011 uses a variable gain RF amplifier and an I/Q

preceded by a double balanced mixer, where a driver amplifier

drives the LO (see Figure 1). The combination of design, process,

and packaging technology allows the functions of these

subsystems to be integrated into a single die, using mature

packaging and interconnection technologies to provide a high

performance, low cost design with excellent electrical,

mechanical, and thermal properties. In addition, the need for

external components is minimized, optimizing cost and size.

LO DRIVER AMPLIFIER

The LO driver amplifier takes a single LO input and doubles the

frequency, amplifying it to the desired LO signal level for the

mixer to operate optimally. The LO driver amplifier requires a

single dc bias voltage (VDLO), which draws about 160 mA at

3.5 V under the LO drive. The LO drive range of −4 dBm to

+4 dBm makes it compatible with Analog Devices, Inc.,

wideband synthesizer portfolio without the requirement for

an external LO driver amplifier.

MIXER

The mixer is an I/Q double balanced mixer and reduces the

need for filtering unwanted sideband. An external 90° hybrid is

required to select the desired sideband of operation.

The ADMV1011 has been optimized to work with the

Mini-Circuits QCN-45+ RF 90° hybrid.

RF AMPLIFIER

The RF amplifier is a variable gain amplifier where the gain can

be adjusted by changing the control voltages (VCTL2 and

VCTL3). The RF amplifier requires two dc bias voltages

(VDRF1 and VDRF2) and two dc gate bias voltages (VGRF1

and VGRF2) to operate. Starting at −1.8 V at the gate supply

(VGRF1 and VGRF2), the RF amplifier is biased at 5 V (VDRF1

and VDRF2). Then, the gate bias (VGRF1 and VGRF2) is varied

until the desired RF amplifier bias current (IDRF1 and IDRF2)

is achieved. The desired RF amplifier bias current is 220 mA for

IDRF1 and 75 mA for IDRF2 under small signal conditions.

The ADMV1011 has an internal band-pass filter between the

mixer and the RF driver amplifier that reduces LO leakage and

filters out the lower sideband at the RF output. The balanced

input drive allows exceptional linearity performance compared

to similar single-ended solutions.

The typical application circuit (see Figure 56) shows the

necessary external components on the bias lines to eliminate

any undesired stability problems for the RF amplifier and the

LO amplifier.

The ADMV1011 upconverter comes in a compact, thermally

enhanced, 4.9 mm × 4.9 mm, 32-terminal ceramic leadless chip

carrier (LCC) package. The ADMV1011 operates over the

−40°C to +85°C temperature range.

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