Stats

Locked Locked
Replies 0
Subscribers 63
Views 12937
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

VGA design from 0-5GHz bandwidth

I'm designing a project with 0-5GHz VGA. With 1dB gain steps from 12dB to 20dB. Power less than 1W. 50 Ohm input/output impedance.

My architecture is using resistive CS amplifiers (2 stage cascaded), then use the attenuator with variable transistor widths to vary the gain.

1. Is my architecture correct ?

2. I'm getting very high output impedance ~700-800 ohm. How do I bring it to 50 Ohm ?

3. Can I use common-drain at output stage as a buffer ?

Thanks

Param

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.