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[SOLVED] Conversion Of a differential ammplifier to a unity gain buffer

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i am needed to design a differential amplifier with active load a simple differential pair with a single ended output and then want to turn this amplifier to a unity gain buffer !!!!! after doing that i am needed to address to the stability operations !!!!!
PROBLEMS FACED ARE:
how to convert this diiferential amplifier to a unity gain buffer
and to satablize it what technique should i use a compensation capacitor or what ? and how ?
 

is this an op-amp differential amp ? if so the gain, unity or otherwise is selected by choosing feedback resistor values.
some have external compensation capacitor terminals. Otherwise additional to the feedback resistor, you can
in parallel add an RC to effect the gain bandwidth. All within the capabilities of the device itself though - its openloop
gain bandwidth. eg a LM741 is cheaper and less capable than a LM358 in gain bandwidth.
 

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