ISL5216EVAL1【PDF 24/65 页】EVALUATION BOARD FOR ISL5216KI

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ISL5216

24-bit programmable FIR filter output into the range of 20-bit

and shorter words in the output section. Without gain control,

a signal at -72dBFS = 20log 10 (2 -12 ) at the input would have

only 4 bits of resolution at the output if a 16 bit word length

were to be used (12 bits less than the full scale 16 bits). The

potential increase in the bit resolution due to processing gain

of the filters can be lost without the use of the AGC.

Figure 4 shows the Block Diagram for the AGC Section. The

FIR filter data output is routed to the Cartesian to polar

coordinate converter after passing through the AGC

multipliers and shift registers. The magnitude output of the

Cartesian to polar coordinate converter is routed through the

AGC error detector, the AGC error scaler and into the AGC

loop filter. This filtered error term is used to drive the AGC

multiplier and shifters, completing the AGC control loop.

The AGC multiplier/shifter portion of the AGC is identified in

Figure 4. The gain control from the AGC loop filter is

sampled when new data enters the multiplier/shifter. The

limit detector detects overflow in the shifter or the multiplier

and saturates the output of I and Q data paths

independently. The shifter has a gain from 0 to 90.31dB in

6.021dB steps, where 90.31dB = 20log 10 (2 N ) when

N = 15. The mantissa provides up to an additional 6.02dB of

gain. The gain in dB from the mantissa is:

20log 10 [1 + (X)2 -14 ], where X is the fractional part of the

mantissa interpreted as an unsigned integer ranging from 0

to 2 14 - 1.

Thus, the AGC multiplier/shifter transfer function is

expressed as:

AGC Mult/Shift Gain = 2 N [1 + (X)2 -14 ]

where N, the shifter exponent, has a range of 0 < N < 15 and

X, the mantissa, has a range of 0 < X < (2 14 -1).

AGC LOOP FILTER

μ P

AGC ERROR SCALING

(RANGE = -2.18344 TO 2.18344)

AGC

ERROR

DETECTOR

SERIAL

OUT

19

MSB = 0

M

U

X

+

28

16

MANTISSA

μ P

16

MSB = 0

EXP

4

4

Δ

(11 MANTISSA

4 EXPONENT)

EN AGC

LOAD

18

LIMIT

DET

UPPER LIMIT ?

LOWER LIMIT ?

AGCGNSEL

24

4

EXP=2 NNNN

24

16 MANTISSA =

01.XXXXXXXXXXXXXX

LIMIT

DET

24

MAGNITUDE

(RANGE = 0 TO 2.32887)

(RANGE = 0 TO 1)

16

IFIR

IAGC

CARTESIAN

LIMIT

DET

TO

POLAR

COORDINATE

CONVERTER

QFIR

24

24

24

(G = 1.64676)

QAGC

AGC MULTIPLIER/SHIFTER

? Controlled via microprocessor interface.

FIGURE 4. AGC FUNCTIONAL BLOCK DIAGRAM

24

FN6013.3

July 13, 2007

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