AFE5808A datasheet(41/66 Pages) TI1

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500Ω

I/V Sum

Amp

Cext

Rint/Rext

CW_OUTM

CW_OUTP

Mixer Clock 1

Mixer Clock 2

Mixer Clock 8

LNA1

IN1

INM1

LNA2

IN2

INM2

LNA8

IN8

INM8

ACT1

ACT2

ACT8

CW I or Q CHANNEL

Structure

INPUT1

INPUT2

INPUT8

CW _AMPINP

CW_AMPINM

10Ω

Vi(t)

Vo(t)

LO(t)

(

) ( )

( )

(

)

(

)

(

)

(

)

Vi(t)

sin

LO(t)

sin

sin 3

sin 5

t ...

Vo(t)

cos

cos 2

...

w + w + j +

p ë

w + f -

w - w + f

AFE5808A

www.ti.com

SLOS729B – OCTOBER 2011 – REVISED APRIL 2012

Note: the 10

Ω resistors at CW_AMPINM/P are due to internal IC routing and can create slight attenuation.

Figure 70. A Complete In-phase or Quadrature Phase Channel

The CW mixer in the AFE5808A is passive and switch based; passive mixer adds less noise than active mixers.

It achieves good performance at low power. The below illustration and equations describe the principles of mixer

operation, where Vi(t), Vo(t) and LO(t) are input, output and local oscillator (LO) signals for a mixer respectively.

The LO(t) is square-wave based and includes odd harmonic components as the below equation expresses:

Figure 71. Block Diagram of Mixer Operation

(2)

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