AS1700-NPN 데이터 시트보기 (PDF) - Astec Semiconductor => Silicon Link

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AS1700-NPN

Semicustom Bipolar Array

Astec Semiconductor => Silicon Link 

Semicustom Bipolar Array

AS17xx

Functional Circuit Blocks

The following circuits are presented as a guide to assist in circuit design using the AS17xx

Semicustom Array.Complex circuit functions can be created from these elementry building

blocks.These circuit blocks can be modified and improved to suit the designer’s needs in creating a

complete system.

Current Sources

Here are a few examples of PNP current sources; NPN current sinks can easly be derived from the

analog of these PNP examples.

IIN

IOUT

Figure 2. Simple PNP Current Source.

Has Slower Frequency

Response, and up to ±15%

Tolerance Error.

IOUT = IIN * (1 + 2/β)

IIN

IOUT

Figure 3. Widlar Current Source,

Moderate Frequency

Response.

IOUT = IIN * (1 + 2/β2)

IIN

IOUT

Figure 4. Wilson Current Source,

Fast Frequency

Response.

IOUT = IIN * (1 + 1/2β2)

Comparator Input Stages

Several comparator input stages are illustrated below.

VCC

VCC

VCC

V–

V+

VO

V+

V–

V+

VO

V–

VO

Figure 5. Simple NPN Type

Comparator.

Figure 6. Simple NPN Type

Comparator Input Stage.

Figure 7. Improved PNP Type

(Good GND Sensing)

Comparator Input Stage.

ASTEC Semiconductor

131

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