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In a stand mixer fitted with the whisk attachment, beat the sugar and eggs together until light and fluffy. Add the ricotta, orange liqueur and orange zest and mix together. Transfer the batter to the prepared pan and place the pan in a large roasting pan. Dust the top of the cheesecake with cinnamon. Place the pan next to the oven and fill the roasting pan with enough hot water to come halfway up the sides of the springform pan. Bake until golden and a toothpick inserted in the middle of the cheesecake comes out clean, about 2 hours.
Cool the cake to room temperature and then transfer to the refrigerator to cool for at least 4 hours, or up to overnight.
Top the cake with the mandarin oranges, then slice and serve.