http://iet.metastore.ingenta.com
1887

Design considerations for BJT active mixers

Design considerations for BJT active mixers

For access to this article, please select a purchase option:

Buy chapter PDF
£10.00
(plus tax if applicable)
Buy Knowledge Pack
10 chapters for £75.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend to library

You must fill out fields marked with: *

Librarian details
Name:*
Email:*
Your details
Name:*
Email:*
Department:*
Why are you recommending this title?
Select reason:
 
 
 
 
 
Low-power HF Microelectronics: a unified approach — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

This chapter has discussed the design of various types of receiver mixers, starting with basic discrete forms, then moving on to classical topologies. The benefits of emitter degeneration to improve linearity were quantified, after which we showed the advantages afforded by the bipolar 'multi-tanh' concept. This circuit concept has been extensively used by the author, and is now proving useful in extending the dynamic range in many contemporary communications ICs. Multi-tanh gm stages have the further advantage of allowing accurate variable gain through the control of the bias current, not possible with many mixer designs. Finally, the topic of noise in the switching core was briefly discussed. Other novel mixer topologies are now being used to extend the performance of active mixers even further. In the future, it is expected that quite different approaches to mixer design, based on sub-micron CMOS processes, will become commonplace, though it is difficult to forecast whether (and if so, how soon) such techniques will eclipse bipolar technologies in RF applications. With increasing interest in short-range transceivers operating at frequencies of between 2 and 30GHz, and the benefits of heterojunction bipolar transistors in this domain, it will be interesting to see how this age-old rivalry will develop.

Inspec keywords: microwave integrated circuits; CMOS integrated circuits; heterojunction bipolar transistors; microwave mixers

Other keywords: emitter degeneration; bipolar multi-tanh concept; BJT active mixers; bias current; contemporary communications IC; submicron CMOS processes; HBT; receiver mixers; heterojunction bipolar transistors; basic discrete forms; short-range transceivers; mixer topologies

Subjects: Modulators, demodulators, discriminators and mixers

Preview this chapter:
Zoom in
Zoomout

Design considerations for BJT active mixers, Page 1 of 2

| /docserver/preview/fulltext/books/cs/pbcs008e/PBCS008E_ch23-1.gif /docserver/preview/fulltext/books/cs/pbcs008e/PBCS008E_ch23-2.gif

Related content

content/books/10.1049/pbcs008e_ch23
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Loading
This is a required field
Please enter a valid email address