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参数资料
| 型号： | MICRF300YC6 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC AMP 100/1000MHZ LN SC70-6 |
| 标准包装： | 3,000 |
| 系列： | * |
Micrel, Inc.
Functional Description
The MICRF300 is a low-noise amplifier (LNA) which
operates over the 100 to 1000MHz frequency range. The
device operates from a 1.8V to 3.6V voltage supply, where
it consumes 2.5mA of supply current during operation, and
1 μ A (max) of current in shutdown. A simple LC input
matching network is required to optimize the device for
best noise figure. A simple LC network is required to bias
the output stage and match the output to the following
stage. Recommended matching networks have been
provided for 315MHz, 433.92MHz and 900MHz. See
Evaluation Board and Bill of Materials for recommended
component values. See Figure 1 for Block Diagram of the
MICRF300.
Input Matching
The RF input pin, RFIN (Pin 3) is directly connected to the
base of the RF input device. In normal operation, the DC
voltage of this pin is one diode above GND. The
MICRF300 requires an input matching network for optimal
noise figure, gain and linearity. A series inductor and a DC-
blocking capacitor are required to implement this network.
A high-Q, wire-wound type inductor is recommended for
lowest noise figure at 315MHz and 433.92MHz. A
standard multi-layer ceramic inductor can be used, but the
noise figure degrades by 0.2 dB. At 900MHz, a standard
multi-layer ceramic inductor may be used as the
inductance value is very low, and the Q does not make a
measurable difference. See recommended component
values in the Typical Performace and Matching Component
Values section of the data sheet.
Functional Diagram
Figure 1: Block Diagram
MICRF300
Output Bias and Matching
The output stage has an internal pull-up resistor of 250 Ω .
To resonate out any parasitic capacitance and to increase
output swing capability, a multi-layer ceramic inductor
should be connected from the RF output, RFOUT (Pin 5)
pin to V CC . See recommended component values in the
Typical Performance and Matching Component Values
table of the data sheet.
Enable
The MICRF300 features a logic-level enable, EN (Pin 1). A
logic-level low disables the device. A logic-level High
enables the device. The value of the input DC-blocking
capacitor will affect the enable and disable time of the
device.
Power Supply Bypassing
Minimum supply bypassing is needed on PCB board to
filter out AC fluctuations in supply voltage. It is achieved by
placing a 0.1 μ F capacitor as close as possible between the
V CC (Pin 6) and GND (Pins 2 and 4). Refer to the
MICRF300 Evaluation Board for recommend layout.
April 2012
7
M9999-041712-B
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