Low Noise Active Mixer

4 - 23 GHz

Rev. V2

MAMX-011023

10

10

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Applications Section

System usage of this Mixer

The MAMX-011023 may be used in single ended, balanced, and image reject circuit configurations.

Single Ended Mixer

The single Ended mixer is the simplest use of the MAMX-011023. Some form of combiner is needed to put both

the RF and LO signals on the input port and this combiner must allow low loss to the RF signal to preserve the

low noise figure. A 10 dB quarter wavelength coupled line section can form a convenient and low cost combiner.

The single ended mixer will have minimal rejection of RF, LO and image products at the IF.

Balanced Mixer

The balanced mixer will improve mixer performance by cancelling the LO at the IF output and cancelling RF

second order products. Linearity will be improved by using two mixers and RF loss will be limited to the rat race

and transformer insertion losses.

Image Reject Mixer

The Image Reject mixer can reject the desired upper or lower sideband RF signal and reject the corresponding

image.

LO

RF

50 Ω

W2

W1

Coupler

10 dB

10 GHz

2

1

4

3

LO

MAMX-011023

50 Ω

IF

50 Ω

1

3

4

2

W1

W2

3

4

1

2

W1

W2

3

4

1

2

3

1

4

2

50 Ω

50 Ω

100 Ω

LO

RF

MAMX-011023

MAMX-011023

LO

RF

1

2

3

5

4

IF

MAMX-011023

MAMX-011023

6

3

6

3

4

4

4

4

3