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MC10E197 Scheda tecnica(PDF) 8 Page - ON Semiconductor

Il numero della parte MC10E197
Spiegazioni elettronici  5V ECL Data Separator
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Produttore elettronici  ONSEMI [ON Semiconductor]
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Filter Input
The primary function of the filter input subsection is to
convert the output of the phase detector into a single ended
signal for subsequent processing by the integrator circuitry. This
subsection consists of the 10E197 charge pump current sinks,
two shunt capacitors, and a differential summing amplifier
(Figure 5).
Hence, this portion of the filter circuit contributes a real pole
and two complex poles to the overall loop transfer function F(s).
Before these pole locations are selected, appropriate values for
the current setting resistors (RSETUP and RSETDN) must be
ascertained. The goal in choosing these resistor values is to
maximize the gain of the filter input subsection while ensuring
the charge pump output transistors operate in the active mode.
The filter input gain is maximized for a charge pump current of
1.1 mA; a value of 464 Ω for both RSETUP and RSETDN
yields a nominal charge pump current of 1.1 mA.
It should be noted that a dual bandwidth implementation of
the phase lock loop may be achieved by modifying the current
setting resistors such that an electronic switch enables one of two
resistor configurations. Figure 6 shows a circuit configuration
capable of providing this dual bandwidth function. Analysis of
the filter input circuitry yields the transfer function:
F1(s) = K1 *
1
(s + p1)
*
1
where:
The gain constant is defined as:
K1 = A1 *
1
CIN
eqt. 3
A1= op-amp gain constant for the
selected pole positions.
CIN = phase detector shunt capacitor.
[s2 + (2ζω ) s + ω2 ]
o1
o1
The real pole is a function of the input resistance to the
op-amp and the shunt capacitors connected to the phase detector
output. For stability the real pole must be placed beyond the
unity gain frequency; hence, this pole is typically placed
midway between the unity crossover and phase detector
sampling frequency, which should be about ten times greater.
ELECTRONIC SWITCH
VEEVCO
VEEVCO
RSETUP
RSETDN
464Ω
464Ω
464Ω
464Ω
Figure 6. Dual Bandwidth Current
Source Implementation
The second order pole set arises from the two pole model for
an op-amp. The open loop gain and the first open loop pole for
the op-amp are obtained from the data sheets. Typically,
op-amp manufacturers do not provide information on the
location of the second open loop pole; however, it can be
approximated by measuring the roll off of the op-amp in the
open loop configuration. The second pole is located where the
gain begins to decrease at a rate of 40 dB per decade. The
inclusion of both poles in the differential summing amplifier
transfer function becomes important when closing the
feedback path around the op-amp because the poles migrate;
and this migration must be accounted for to accurately
determine the phase lock loop transient performance.
Typically the op-amp poles can be approximated by a pole
pair occurring as a complex conjugate pair making an angle of
45° to the real axis of the complex frequency plane. Two
constraints on the selection of the op-amp pole pair are that the
poles lie beyond the crossover frequency and they are
positioned for near unity gain operation. Performing a root
locus analysis on the op-amp open loop configuration and
adhering to the two constraints yields the pole positions
contributed by the op-amp.
Determination of Element Values
Since the difference amplifier is configured to operate as a
differential summer the resistor values associated with the
amplifier are of equal value. Further, the typical input
resistance to the summing amplifier is 1 kΩ; thus, the op-amp
resistors are set at 1 kΩ. Having set the input resistance to the
op-amp and selected the position of the real pole, the value of
the shunt capacitors is determined using the following
relationship:
⎥ p1⎥ =
1
2πR1CIN
eqt. 4
Augmenting Integrator
The augmenting integrator consists of an active filter with a
lag-lead network in the feedback path (Figure 7).
VIN
VCCVCO
MC34182
RIA
RA
CA
VO2
RIA
Figure 7. Integrator Subsection


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