HMC8191LC4TR-R5 datasheet(41/44 Pages) AD

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Data Sheet

HMC8191

Rev. C | Page 41 of 44

APPLICATIONS INFORMATION

Figure 149 shows the typical application circuit for the HMC8191.

To select the appropriate sideband, an external 90° hybrid is

needed. For applications not requiring operation to dc, use an

off-chip dc blocking capacitor. For applications that require the

LO signal at the output to be suppressed, use a bias tee or RF

feed as shown in Figure 149. Ensure that the source or sink

current used for LO suppression is <3 mA for each IF port to

prevent damage to the device. The common-mode voltage for

each IF port is 0 V.

To select the upper sideband when using as an upconverter,

connect the IF1 pin to the 90° port of the hybrid, and connect

the IF2 pin to the 0° port of the hybrid. To select the lower

sideband, connect IF1 to the 0° port of the hybrid and IF2 to the

90° port of the hybrid. The input is from the sum port of the

hybrid and the difference port is 50 Ω terminated.

To select the upper sideband (low-side LO) when using as a

downconverter, connect the IF1 pin to the 0° port of the hybrid,

and connect the IF2 pin to the 90° port of the hybrid. To select

the lower sideband (high-side LO), connect the IF1 pin to the

90° port of the hybrid and IF2 to the 0° port of the hybrid. The

output is from the sum port of the hybrid, and the difference

port is 50 Ω terminated.

50Ω

HMC8191 EVALUATION BOARD

SUPPLY

FOR IF1

SUPPLY

FOR IF2

BIAS TEE/

DC FEED FOR IF2

BIAS TEE/

DC FEED FOR IF1

DC BLOCKING

CAPACITORS

EXTERNAL

90° HYBRID

NOTES

1. DASHED SECTIONS ARE OPTIONAL AND MEANT FOR LO NULLING.

Figure 149. Typical Application Circuit

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