lna

LNAPGA

GainSel

Vzap

Squid FB

Squid Bias

SquidPhonon

3

PGA

GainSel

3

FB Synthesizer

Default Phonon Front End (No change in active components from Rev A)

Av100Av

AvAvdc

AD8130

LT6910

LT6910

AD797

LNAPGA

GainSel

Vzap

Squid FB

Squid Bias

SquidPhonon

3

PGA

SPI3

FB Synthesizer

Option: Use LMP8100

Av100Av

Av

Avdc

AD8130

LMP8100

LT6910

AD797

The good: Extended gain range, fewer control wires

The bad: Requires ±2.5V Power

LNAPGA

GainSel

Vzap

Squid FB

Squid Bias

SquidPhonon

3

VGA

VGain (24db range)1

FB Synthesizer

Av100Av

AvdbAvdc

AD8130

AD8337 VGA

LT6910

AD8337 LNA

The good: Extended gain range, small footprint, fewer chips

The bad: Higher power, marginal noise performance,

Option: Use AD8337

unknown 1/F corner, requires a DAC channel for gain setting

LNAPGA

GainSel

Vzap

Squid FB

Squid Bias

SquidPhonon

3

PGA

GainSel

2

FB Synthesizer

Option: use AD8250

Av100Av

Av

AD8250

AD8066(e.g.)

LT6910

AD797

Av

The good: Flexible topology, small footprint, fewer control wires

The bad: Limited gain range, 2 devices don’t have enough gain