Search International and National Patent Collections

1. (WO2017032843) LOW POWER AND AREA BOOTSTRAPPED PASSIVE MIXER WITH SHARED CAPACITANCES

Pub. No.:    WO/2017/032843    International Application No.:    PCT/EP2016/070100
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Fri Aug 26 01:59:59 CEST 2016
IPC: H03D 7/14
H03D 7/16
H04L 25/08
Applicants: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Inventors: MASTANTUONO, Daniele
MATTISSON, Sven
Title: LOW POWER AND AREA BOOTSTRAPPED PASSIVE MIXER WITH SHARED CAPACITANCES
Abstract:
In a passive mixer (10), switches (M1, M2, M5) and a capacitance are shared between bootstrapped mixing transistors (PNI, NNI, NPI, PPI, PNQ, NNQ, NPQ, PPQ), reducing the number of components required as compared to prior art bootstrap designs. Shared bootstrap circuits (16, 18, 20, 22) operate in an interleaved fashion between I and Q mixer circuits (12, 14), at twice the LO frequency. That is, the shared bootstrap circuits (20, 22) in each Q mixer circuit (12) charge their capacitors in a first half-period of a clock (Clk), and connect the shared capacitor to the gate of an enabled mixing transistor (PNQ, NNQ, NPQ, PPQ) in the second half-period. The shared bootstrap circuits (16, 18,) in the I mixer circuit (14) charge their capacitors in the second half-period, and connect the shared capacitor to the gate of an enabled mixing transistor (PNI, NNI, NPI, PPI,) in the first half- period. One of two mixing transistors (PNI, NNI, NPI, PPI, PNQ, NNQ, NPQ, PPQ) connected to each shared bootstrap circuit (16, 18, 20, 22) is alternately enabled during the clock signal half-periods that the shared bootstrap circuit (16, 18, 20, 22) is not charging its capacitor.