MC13110A datasheet(42/68 Pages) MOTOROLA

Part #	MC13110A

Description	UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC

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Manufacturer	MOTOROLA [Motorola, Inc]

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MC13110A/B MC13111A/B

42

MOTOROLA ANALOG IC DEVICE DATA

the first LO may effect parameters like adjacent channel

rejection and intermodulation. Figure 100 shows a loopfilter

architecture incorporating an additional pole.

From

Phase

Detector

To VCO

R2

C2

C1

Figure 100. Loop Filter

with Additional Integrating Element

C3

R3

For the additional pole formed by R3 and C3 to be efficient,

the cut–off frequency must be much lower than the reference

frequency. However, it must also be higher than wp in order

not to compromise phase margin too much. The following

equations were derived in a similar manner as for the basic

filter previously described.

Similarly, it can be shown:

A

openloop +

–

K

pd

Ko

Knw2 (C1 ) C2 ) C3) –w2C1C2C3R2R3

)

1

) jwT2

1

) jwT1

(16)

In which:

T1

+

(C1

) C2)T2 ) (C1C2)T3

C1

) C2 ) C3 * w2C1T2T3

(17)

T2

+ R2C2

T3

+ R3C3

(19)

(18)

From T1 it can be derived that:

C2

+

(T1

) T2)C3 * C1 T2 ) T3 * T1 ) w2T1T2T3

T3

* T1

(20)

In analogy with (10), by forcing the loopgain to 1 (0 dB) at

wp, we obtain:

C1

(T1

) T2) ) C2T3 ) C3T2 +

K

pd

Ko

Knwp

2

1

) wpT2

2

1

) wpT1

2

(21)

Solving for C1:

C1

+

(T2

* T1)T3C3 * (T3 * T1)T2C3 ) (T3 * T1)

K

pd

KoT1

wp

2K

n

1

) wpT2

2

1

) wpT1

2

(T3

* T1)T2 ) (T3 * T1)T3 * T2 ) T3 * T1 ) wp2T1T2T3 T3

(22)

By selecting wp via (9), the additional time constant

expressed as T3, can be set to:

T3

+ 1

Kwp

(23)

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