Multiple-input and multiple-output amplifier using mutual induction in the feedback network

a feedback network and amplifier technology, applied in the field of amplifiers, can solve the problem that the word “inductance” cannot be used to designate the quantity referred, and achieve the effect of limited flexibility

Active Publication Date: 2015-07-28
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a multiple-input and multiple-output amplifier with a feedback network that provides a non-diagonal matrix approximating a given matrix. The feedback network has windings that have a non-negligible influence on the value of non-diagonal components of the matrix. The technical effect of the invention is that it provides a more accurate and efficient amplifier with improved performance. The feedback network can be composed of linear, passive windings or windings with magnetic circuit or printed circuit board traces. The invention can be used in various applications such as RF communication devices.

Problems solved by technology

However, the French word “inductance” cannot be used to designate the quantity referred to as “mutual inductance”.

Method used

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  • Multiple-input and multiple-output amplifier using mutual induction in the feedback network
  • Multiple-input and multiple-output amplifier using mutual induction in the feedback network
  • Multiple-input and multiple-output amplifier using mutual induction in the feedback network

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first embodiment (

Best Mode)

[0038]As a first embodiment of a device of the invention, given by way of non-limiting example and best mode of carrying out the invention, we have represented in FIG. 1 a multiple-input and multiple-output amplifier of the invention comprising 4 signal input terminals (11) (12) (13) (14), 4 signal output terminals (21) (22) (23) (24), 4 active sub-circuits (30) and a feedback network (40). Each active sub-circuit has a sub-circuit input terminal connected to one of the signal input terminals (11) (12) (13) (14), a sub-circuit output terminal connected to one of the signal output terminals (21) (22) (23) (24), and a sub-circuit common terminal. Each active sub-circuit is such that the current flowing out of the sub-circuit common terminal and the current flowing into the sub-circuit output terminal depend on the voltage between the sub-circuit input terminal and the sub-circuit common terminal. The feedback network (40) has a terminal connected to the reference terminal re...

second embodiment

[0043]The second embodiment of a device of the invention, given by way of non-limiting example, also corresponds to the multiple-input and multiple-output amplifier of the invention represented in FIG. 1.

[0044]The schematic diagram of FIG. 3 shows a feedback network (40) used in this second embodiment, having a terminal connected to the reference terminal (shown as the ground symbol) and four other terminals (499). The feedback network (40) is made of four windings (501), (502), (503) and (504) each connected in series with one of the four resistors (401), (402), (403) and (404). The non-diagonal components in the impedance matrix ZFB of the feedback network are attributable to the mutual induction between the different windings and to the five resistors (412), (423), (434), (413) and (424). We note that, in this second embodiment, the impedance matrix ZFB of the feedback network is invertible and non-diagonal at all frequencies.

[0045]In this second embodiment, each active sub-circu...

third embodiment

[0046]The third embodiment of a device of the invention, given by way of non-limiting example, corresponds to the multiple-input and multiple-output amplifier of the invention represented in FIG. 4. This multiple-input and multiple-output amplifier comprises 4 signal input terminals (11) (12) (13) (14), 4 signal output terminals (21) (22) (23) (24), 4 active sub-circuits (30) and a feedback network.

[0047]In FIG. 4, the 4 active sub-circuits (30) each comprise a first MOSFET (31) and a second MOSFET (32) in the cascode configuration well known to specialists. The four current sources (38) provide the biasing of the sub-circuit output terminals. The bias voltage VG for the gates of the second MOSFET (32) must be provided by external circuits not shown in FIG. 4. An appropriate biasing of the signal input terminals (11) (12) (13) (14) must be provided by external circuits not shown in FIG. 4.

[0048]The feedback network is made of four resistors (401), (402), (403) and (404) and of four ...

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Abstract

The invention relates to an amplifier capable of producing a plurality of output signals, these output signals being controlled by a plurality of input signals. A multiple-input and multiple-output amplifier of the invention includes 4 signal input terminals, 4 signal output terminals, 4 active sub-circuits and a feedback network. Each active sub-circuit has a sub-circuit input terminals connected to one of the signal input terminals, a sub-circuit output terminal connected to one of the signal output terminals and a sub-circuit common terminal. The feedback network uses mutual induction between windings. The feedback network has terminals connected to the sub-circuit common terminal of the active sub-circuits. The feedback network presents an impedance matrix producing a negative feedback such that the transfer admittance matrix of the multiple-input and multiple-output amplifier approximates a given admittance matrix.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit of priority to International Patent Application No. PCT / IB2007 / 001344 filed Apr. 26, 2007, which further claims the benefit of priority to France Patent Application No. 0605633 filed Jun. 23, 2006, the contents of which are hereby incorporated by reference in their entirety.FIELD OF THE INVENTION[0002]The invention relates to an amplifier capable of producing a plurality of output signals, these output signals being controlled by a plurality of input signals.[0003]The French patent application number 06 / 05633 of 23 Jun. 2006, entitled “Amplificateur à entrées multiples et sorties multiples utilisant l'induction mutuelle dans le réseau de rétroaction” is incorporated by reference.PRIOR ART[0004]Let us consider the problem of designing an amplifier having a plurality of output terminals and a plurality of input terminals, the amplifier being such that the output signals are each a linear combinatio...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H03F1/36H03F3/189H03F3/68H03F1/34H03F1/22
CPCH03F1/223H03F1/34H03F3/189H03F3/68H03F2200/117H03F2200/492
InventorBROYDE, FREDERICCLAVELIER, EVELYNE
OwnerAPPLE INC