PE64907 datasheet(7/10 Pages) PSEMI

Part #	PE64907

Description	UltraCMOS짰 Digitally Tunable Capacitor (DTC)100-3000 MHz

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Manufacturer	PSEMI [Peregrine Semiconductor]

Direct Link	http://www.psemi.com

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Document No. DOC-30214-2 │ www.psemi.com

Product Specification

PE64907

0.0

0.5

1.0

1.5

2.0

2.5

3.0

0

5

10

15

20

25

30

State

Capacitance in Series

Configuration (Cs)

Capacitance in Shunt

Configuration (Cs+Cp1)

0

0.5

1

1.5

2

2.5

3

-40

-35

-30

-25

-20

-15

-10

-5

0

Frequency (GHz)

C0

C1

C2

C4

C8

C16

C31

Series Operation

In Series configuration, the effective capacitance

between RF+ and RF- ports is represented by Cs

and tuning ratio as CSmax/CSmin.

Figure 16. Measured Series S21 vs. Frequency

Configuration

Cmin

(state 0)

Cmax

(state 31)

Tuning

Ratio

Series (RF+ to RF-)

0.38

2.12

5.58:1

0.85

2.4

2.82:1

Shunt (RF+ to GND)

Effective

Capacitance

CS

CS + CP1

When the DTC is used as a part of a reactive

network, impedance transformation may cause the

internal RF voltages (VP and VM in Figure 12) to

exceed peak operating RF voltage. The complete

RF circuit must be simulated using actual input

power and load conditions to ensure neither VP nor

VM exceeds 30 Vpk.

Figure 13. Effective Capacitance Diagram

Figure 14. Typical Capacitance vs. State

S11 and S21 for series configuration is illustrated in

Figures 15 and 16. S21 includes mismatch and

dissipative losses and is not indicative of tuning

network loss. Equivalent Circuit Model can be used

for simulation of tuning network loss.

Frequency(.3 - 3000 MHz)

S

11 C0

S

22 C0

S

11 C1

S

22 C1

S

11 C2

S

22 C2

S

11 C4

S

22 C4

S

11 C8

S

22 C8

S

11 C15

S

22 C15

S

11 C31

S

22 C31

Table 9. Effective Capacitance Summary

Figure 15. Measured Series S11/S22 (major states)

Shunt Configuration (looking into RF+ when RF- is

grounded) will have higher total capacitance at RF+

due to parallel combination of Cs with parasitic

capacitance CP1 (CS + CP1), as demonstrated in

Figure 14 and Table 9.

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