Linearization of BJTs with logarithmic predistortion
Lunden, Olli-Pekka; Paldanius, Timo (2019-05-14)
Lunden, Olli-Pekka
Paldanius, Timo
IEEE
14.05.2019
2019 IEEE Radio and Wireless Symposium, RWS 2019
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:tuni-201910224000
https://urn.fi/URN:NBN:fi:tuni-201910224000
Kuvaus
Peer reviewed
Tiivistelmä
This paper proposes a novel linearization technique for bipolar junction transistors (BJT) and their derivatives, e.g., heterojunction BJTs. Since the non-linearity of BJTs is exponential by nature, analog predistortion caused by a logarithmic amplifier should linearize the response completely, in theory. This paper reports that, in practice, cascading a logarithmic amplifier in front of a simple one-transistor BJT amplifier boosted its output third-order inter-modulation intercept point (OIP3) by 10 dB. The proposed linearization scheme is extremely simple and it is inherently broadbanded. To the best of our knowledge, this idea has not been reported previously.
Kokoelmat
- TUNICRIS-julkaisut [16929]