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Sep 08 2014

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X-Coupled Input Stage: Fully Balanced Symmetrical, Vertically Mirrored Complementary, Double Floating Differential

A concept.
A Request For Comments (RFQ).

A Cross-Coupled Input Stage (IPS).
Fully Balanced Symmetrical  (FBS).
Vertically Mirrored Complementary  (VMC).
Double, Floating, Differential LTP (DFD LTP).
Cross Coupled Current Mirrors  (CCCM).

For what it is worth, (C) 2014-09-08, zjj_wwa, of hiend-audio.com

IPS FBS Floating VMD 1

Inspired after reading a book of Mr. Bob Cordell: Designing Audio Power Amplifiers”, Figure 7.13: “Complementary IPS with N-channel JFETs.”

Please provide me via email with your views, issues and suggestions related to this concept.
Many Kind Thanks,

The input signal is split and routed in parallel to two quasi-independent, complementary technology (and rail-voltage) modules. Each module consisting of an LTP differential amplifier, floating upon a current source/drain, and equipped with a Common Mode and Floating base  reference voltage amplifier pair. Tops and Bottoms each module is equipped with Current Mirrors.

The twist is that certain parts (i.e. the output-voltage-fixed branches) are criss-crossed between each of the two modules.

A brief “color” analysis would suggest that this thing just might work.

The green dot on the input represents a positive signal pulse.  Other green dots resemble a positive pulse of voltage. Red dots – a negative pulse of the voltage. Green dashes resemble increases in current (pulses). Red dashes – decreases in current (pulses).

The Current source / drain in each of the modules, as per Bob Cordell’s idea, controls the current flowing through each module.

A thing that yet needs to be considered is the control of the DC balance of the consecutive VAS stage.  Most probably to be achieved by fine tuning the currents of the current source/drain pair.


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