X1G005421020400愛普生溫補(bǔ)晶振TCXO溫度補(bǔ)償方式石英晶體振蕩器的應(yīng)用
X1G005421020400愛普生溫補(bǔ)晶振TCXO溫度補(bǔ)償方式石英晶體振蕩器的應(yīng)用
移動(dòng)通信機(jī)電路框圖及其TCXO外觀由于TCXO具有較高的頻率穩(wěn)定度,而且體積小,在小電流下能夠快速啟動(dòng),其應(yīng)用領(lǐng)域重點(diǎn)擴(kuò)展到移動(dòng)通信系統(tǒng).
為移動(dòng)通信機(jī)射頻（RF）電路框圖.愛普生晶振TCXO作為基準(zhǔn)振蕩器為發(fā)送信道提供頻率基準(zhǔn),同時(shí)作為接收通道的第一級(jí)本機(jī)振蕩器；另一只TCXO作為第2級(jí)本機(jī)振蕩器,將其振蕩信號(hào)輸入到第2變頻器.移動(dòng)電話要求的頻率穩(wěn)定度為0.1～2.5ppm（－30～+75℃）,但出于成本上的考慮,通常選用的規(guī)格為1.5～2.5ppm.移動(dòng)電話用12～20MHz的TCXO代表性產(chǎn)品之一是VC－TCXO－201C1,采用直接補(bǔ)償方式.X1G005421020400愛普生溫補(bǔ)晶振,TCXO溫度石英晶體振蕩器
TCXO的溫度補(bǔ)償方式對(duì)石英晶體振子頻率溫度漂移的補(bǔ)償方法主要有直接補(bǔ)償和間接補(bǔ)償兩種類型：
愛普生晶振編碼
型號(hào)
頻率
長(zhǎng)x寬x高
輸出波
電源電壓
頻率偏差
TCXO
工作溫度
X1G005421002900
TG2520SMN
19.200000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
3.135 to 3.465 V
+/-2.0 ppm
TCXO
40 to +85 °C
X1G005421003000
TG2520SMN
12.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
3.135 to 3.465 V
+/-2.0 ppm
TCXO
30 to +85 °C
X1G005421003700
TG2520SMN
16.384000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
40 to +85 °C
X1G005421003800
TG2520SMN
16.384000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
2.260 to 3.465 V
+/-1.5 ppm
TCXO
40 to +85 °C
X1G005421020100
TG2520SMN
16.368000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020200
TG2520SMN
16.369000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020300
TG2520SMN
19.200000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020400
TG2520SMN
26.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020500
TG2520SMN
32.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020600
TG2520SMN
38.400000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020700
TG2520SMN
40.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421020800
TG2520SMN
16.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021100
TG2520SMN
20.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021200
TG2520SMN
24.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021300
TG2520SMN
25.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021400
TG2520SMN
27.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021500
TG2520SMN
30.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421021600
TG2520SMN
48.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421022000
TG2520SMN
52.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421022100
TG2520SMN
27.600000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421022200
TG2520SMN
50.000000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
1.700 to 1.900 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421030100
TG2520SMN
16.368000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
2.660 to 3.465 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421030200
TG2520SMN
16.369000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
2.660 to 3.465 V
+/-1.5 ppm
TCXO
-40 to +85 °C
X1G005421030300
TG2520SMN
19.200000 MHz
2.50 x 2.00 x 0.80 mm
Clipped sine wave
2.660 to 3.465 V
+/-1.5 ppm
TCXO
-40 to +85 °C
間接補(bǔ)償型又分模擬式和數(shù)字式兩種類型.模擬式間接溫度補(bǔ)償是利用熱敏電阻等溫度傳感元件組成溫度－電壓變換電路,并將該電壓施加到一支與晶體振子相串接的變?nèi)荻O管上,通過晶體振子串聯(lián)電容量的變化,日產(chǎn)晶振對(duì)晶體振子的非線性頻率漂移進(jìn)行補(bǔ)償.該補(bǔ)償方式能實(shí)現(xiàn)±0.5ppm的高精度,但在3V以下的低電壓情況下受到限制.
數(shù)字化間接溫度補(bǔ)償是在模擬式補(bǔ)償電路中的溫度—電壓變換電路之后再加一級(jí)模/數(shù)（A/D）變換器,將模擬量轉(zhuǎn)換成數(shù)字量.該法可實(shí)現(xiàn)自動(dòng)溫度補(bǔ)償,使溫補(bǔ)晶振晶體振蕩器頻率穩(wěn)定度非常高,但具體的補(bǔ)償電路比較復(fù)雜,成本也較高,只適用于基地站和廣播電臺(tái)等要求高精度化的情況.
X1G005421020400愛普生溫補(bǔ)晶振,TCXO溫度石英晶體振蕩器
直接補(bǔ)償型TCXO是由熱敏電阻和阻容元件組成的溫度補(bǔ)償電路,在振蕩器中與石英晶體振子串聯(lián)而成的.在溫度變化時(shí),熱敏電阻的阻值和晶體等效串聯(lián)電容容值相應(yīng)變化,從而抵消或削減振蕩頻率的溫度漂移.日本進(jìn)口晶振該補(bǔ)償方式電路簡(jiǎn)單,成本較低,節(jié)省印制電路板（PCB）尺寸和空間,適用于小型和低壓小電石英晶振流場(chǎng)合.但當(dāng)要求晶體振蕩器精度小于±1pmm時(shí),直接補(bǔ)償方式并不適宜.
X1G005421020400愛普生溫補(bǔ)晶振,TCXO溫度石英晶體振蕩器
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