X1G005421020400爱普生温补晶振TCXO温度补偿方式石英晶体振荡器的应用
移动通信机电路框图及其TCXO外观由于TCXO具有较高的频率稳定度,而且体积小,在小电流下能够快速启动,其应用领域重点扩展到移动通信系统.
为移动通信机射频（RF）电路框图.爱普生晶振TCXO作为基准振荡器为发送信道提供频率基准,同时作为接收通道的第一级本机振荡器；另一只TCXO作为第2级本机振荡器,将其振荡信号输入到第2变频器.移动电话要求的频率稳定度为0.1～2.5ppm（－30～+75℃）,但出于成本上的考虑,通常选用的规格为1.5～2.5ppm.移动电话用12～20MHz的TCXO代表性产品之一是VC－TCXO－201C1,采用直接补偿方式.X1G005421020400爱普生温补晶振,TCXO温度石英晶体振荡器
TCXO的温度补偿方式对石英晶体振子频率温度漂移的补偿方法主要有直接补偿和间接补偿两种类型：
爱普生晶振编码
型号
频率
长x宽x高
输出波
电源电压
频率偏差
TCXO
工作温度
X1G005421002900
TG2520SMN
19.200000MHz
2.50x2.00x0.80mm
Clippedsinewave
3.135to3.465V
+/-2.0ppm
TCXO
40to+85°C
X1G005421003000
TG2520SMN
12.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
3.135to3.465V
+/-2.0ppm
TCXO
30to+85°C
X1G005421003700
TG2520SMN
16.384000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
40to+85°C
X1G005421003800
TG2520SMN
16.384000MHz
2.50x2.00x0.80mm
Clippedsinewave
2.260to3.465V
+/-1.5ppm
TCXO
40to+85°C
X1G005421020100
TG2520SMN
16.368000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020200
TG2520SMN
16.369000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020300
TG2520SMN
19.200000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020400
TG2520SMN
26.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020500
TG2520SMN
32.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020600
TG2520SMN
38.400000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020700
TG2520SMN
40.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421020800
TG2520SMN
16.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021100
TG2520SMN
20.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021200
TG2520SMN
24.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021300
TG2520SMN
25.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021400
TG2520SMN
27.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021500
TG2520SMN
30.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421021600
TG2520SMN
48.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421022000
TG2520SMN
52.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421022100
TG2520SMN
27.600000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421022200
TG2520SMN
50.000000MHz
2.50x2.00x0.80mm
Clippedsinewave
1.700to1.900V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421030100
TG2520SMN
16.368000MHz
2.50x2.00x0.80mm
Clippedsinewave
2.660to3.465V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421030200
TG2520SMN
16.369000MHz
2.50x2.00x0.80mm
Clippedsinewave
2.660to3.465V
+/-1.5ppm
TCXO
-40to+85°C
X1G005421030300
TG2520SMN
19.200000MHz
2.50x2.00x0.80mm
Clippedsinewave
2.660to3.465V
+/-1.5ppm
TCXO
-40to+85°C
间接补偿型又分模拟式和数字式两种类型.模拟式间接温度补偿是利用热敏电阻等温度传感元件组成温度－电压变换电路,并将该电压施加到一支与晶体振子相串接的变容二极管上,通过晶体振子串联电容量的变化,日产晶振对晶体振子的非线性频率漂移进行补偿.该补偿方式能实现±0.5ppm的高精度,但在3V以下的低电压情况下受到限制.
数字化间接温度补偿是在模拟式补偿电路中的温度—电压变换电路之后再加一级模/数（A/D）变换器,将模拟量转换成数字量.该法可实现自动温度补偿,使温补晶振晶体振荡器频率稳定度非常高,但具体的补偿电路比较复杂,成本也较高,只适用于基地站和广播电台等要求高精度化的情况.
X1G005421020400爱普生温补晶振,TCXO温度石英晶体振荡器
直接补偿型TCXO是由热敏电阻和阻容元件组成的温度补偿电路,在振荡器中与石英晶体振子串联而成的.在温度变化时,热敏电阻的阻值和晶体等效串联电容容值相应变化,从而抵消或削减振荡频率的温度漂移.日本进口晶振该补偿方式电路简单,成本较低,节省印制电路板（PCB）尺寸和空间,适用于小型和低压小电石英晶振流场合.但当要求晶体振荡器精度小于±1pmm时,直接补偿方式并不适宜.
X1G005421020400爱普生温补晶振,TCXO温度石英晶体振荡器
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