无线视频传输 RF 频率数字下变频器 COFDM 传输频率 2.4G 至 600Mhz 低 BDC

数字下变频器

Wireless Video Transmission RF Frequency Digital Down Converter COFDM Transfer frequency 2.4G to 600Mhz low

卖点

1. Input frequencies from 24000 to 600MHz (Lower 1800Mhz)
2. 高带宽
3. 低相位噪声
4. High-frequency stability

规范

RF Frequency Range: 2400 兆赫
IF Frequency Range: 600 兆赫
回波损耗:-12 分贝
Frequency Accuracy: ±10 ppm
Image Rejection: 60 dBc的
平整度: ±0.5 dB (8MHz带宽)
Conversion Gain: 25 分贝
Phase Noise (分贝/赫兹)
dBc/Hz@1KHz ≤-80
dBc/Hz@10KHz ≤-90
dBc/Hz@100KHz ≤-100
电源电压: 10～15V
Power Current: 100 毫安
工作温度范围: +25 ℃

 

港口

RF IN: SMA-50K
IF OUT: SMA-50K
Power +12V: Stick
接地: Soldering lug

注意

1. The converter does not need to add a low-noise amplifier at the back end.
2. Actual Test: closed-loop test under the frequency of 2.4GHz/bandwidth 4MHz, the receiving sensitivity can reach -105dBm.
3. Input frequency supports 1~3GHz. (We can help customize).
4. Output frequency supports 300~700MHz. (We can support customize).

About the above video:

Our most popular products are wireless video transmitters and receivers. 然而, some clients require modification of the transmission frequency to meet local legal demand, in which case the digital frequency up-down converter block comes in handy. One customer requested that we customize the RF frequency down converter for his 2.4G wireless video transmitter. So the input frequency is 2.4GHz, the output frequency is 600MHz, and the lowdown frequency is 1800MHz. We created the sample in accordance with his specifications. So I showed him a simple video that showed the 2.4G transmitter and 600Mhz receiver working correctly. If you have a similar requirement, such as 1-3G frequency input and 300-700Mhz output, please contact us for a custom solution.

 

What is DDC

In digital signal processing, a digital down-converter (DDC) converts a digitized, band-limited signal to a lower frequency signal at a lower sampling rate in order to simplify the subsequent radio stages. The process preserves all the information in the original signal less that which is lost to rounding errors in the mathematical processes. The input and output signals can be real or complex samples. Often the DDC converts from the raw radio frequency or intermediate frequency down to a complex baseband signal.

建筑学

A DDC consists of three subcomponents: a direct digital synthesizer (DDS), a low-pass filter (LPF), and a down sampler (which may be integrated into the low-pass filter). The DDS generates a complex sinusoid at the intermediate frequency (如果). Multiplication of the intermediate frequency with the input signal creates images centered at the sum and difference frequency (which follows from the frequency-shifting properties of the Fourier transform). The low-pass filters pass the difference (IE. baseband) frequency while rejecting the sum frequency image, resulting in a complex baseband representation of the original signal. Assuming a judicious choice of IF and LPF bandwidth, the complex baseband signal is mathematically equivalent to the original signal. In its new form, it can readily be down-sampled and is more convenient to many DSP algorithms. Any suitable low-pass filter can be used including FIR, IIR, and CIC filters. The most common choice is an FIR filter for low amounts of decimation (less than ten) or a CIC filter followed by an FIR filter for larger down-sampling ratios.

Variations on the DDC

Several variations on the DDC are helpful, including many that input a feedback signal into the DDS. These include:

1. Decision-directed carrier recovery phase-locked loops in which the I and Q are compared to the nearest ideal constellation point of a PSK signal, and the resulting error signal is filtered and fed back into the DDS
2. A Costas loop in which the I and Q are multiplied and low pass filtered as part of a BPSK/QPSK carrier recovery loop

Implementation
DDCs are most commonly implemented in logic in field-programmable gate arrays or application-specific integrated circuits. While software implementations are also possible, operations in the DDS, multipliers, and input stages of the low-pass filters all run at the sampling rate of the input data. This data is commonly taken directly from analog to digital converters (ADCs) sampling at tens or hundreds of MHz. CORDIC is an alternative to the use of multipliers in the implementation of digital down converters.

Here is a client’s customized project, 1300~1400 Mhz input down converter to 300-400Mhz.

图传下变频器中国深圳供应商， 频率定制

名称: 图传下变频器
型号: LWDC-248258I
编号: 1805001
RF +12V IF
名称: 射频下变频器
模型: LWDC-3000I
模型: LWDC-1400
Frequency input 2G~2.7G(2000~2700Mhz)
降低: 1800兆赫
Frequency output: 200Mhz-700Mhz
SN2405002

	最小	类型	最大限度
工作频段 (兆赫)	1300	–	1400	工作频段 （MHz)
本地振荡器 (兆赫)		1000		本振（MHz)
Intermediate frequency (兆赫)	300	–	400	中频（MHz)
Conversion gain Gain(分贝)	18	20	22	变频增益Gain(分贝)
增益平坦度 (分贝)		±1	–	增益平坦度(dB）
Noise figure (分贝)		1.5	–	噪声系数(dB）
Port Standing Wave Ratio VSWR	1.5	1.8	2	端口驻波比VSWR
Port Impedance(欧姆)		50	–	端口阻抗(欧姆)
最大输入功率 (分贝)		-5		最大输入功率（dBm）
Maximum output power (分贝)		15		最大输出功率（dBm)
工作电压 (V)	10	12	15	工作电压（V)
工作电流 (毫安)	130	150	180	工作电流（mA）
工作温度 (℃)	-25		55	工作温度（°C)
储存温度 (℃)	-45		65	存储温度（C)
Dimension mm (without connectors)		62x32x14mm		尺寸 mm (不含连接器)

Customize Frequency Specification Sheet Download

OF 1750Mhz Down

物品	范围
输入频率	2100 MHz ～2500 MHz
输出频率	350 MHz ～750 MHz
本地频率	1750 兆赫
噪声系数	≤1.5dB
获得	15 分贝
载流子泄漏	≤-20dBm
Belt unevenness(8兆赫)	≤1.5dB
IP3:	≥15dBm
最大输入电平	0分贝
驻波比	≤1.5
工作温度	-10～+60℃
电压电流	≤12V/240mA
射频接口	N-50KFD
尺寸	108*48*22毫米
供电方式	Online power supply